| Chiffre d'affaires | — | — | £13 613 568 | £13 233 789 | £12 590 250 | £13 223 308 | £14 865 496 |
| Bénéfice / (perte) | — | — | £726 332 | £816 468 | £747 027 | £616 120 | £1 115 397 |
| Autres revenus | — | — | £3 817 | £3 195 | £305 | £2 430 | £33 841 |
| Total des actifs | £680 256 | £935 812 | £1 888 362 | £2 304 830 | £2 651 857 | £2 842 977 | £3 208 374 |
| Net Assets Liabilities | £680 256 | £935 812 | £1 567 030 | £1 893 362 | £2 309 830 | £2 656 857 | £2 847 977 |
| Equity | £680 256 | £935 812 | £1 888 362 | £2 304 830 | £2 651 857 | £2 842 977 | £3 208 374 |
| Current Assets | £2 172 284 | £2 479 628 | £4 896 561 | £5 427 019 | £6 776 050 | £5 687 802 | £5 838 150 |
| Net Current Assets Liabilities | £160 305 | £512 461 | £1 005 098 | £1 404 561 | £1 938 726 | £2 266 623 | £2 376 988 |
| Total Assets Less Current Liabilities | £768 693 | £1 006 597 | £1 678 307 | £1 998 925 | £2 389 956 | £2 775 217 | £2 987 264 |
| Cash Bank On Hand | £172 380 | £63 | £1 368 720 | £2 467 525 | £3 580 667 | £1 980 506 | £2 016 692 |
| Debtors | £1 999 904 | £2 479 565 | £3 527 841 | £2 959 494 | £3 195 383 | £3 707 296 | £3 821 458 |
| Other Debtors | £134 843 | £140 088 | £20 352 | £17 801 | £18 777 | £21 573 | £20 772 |
| Creditors | £2 011 979 | £1 967 167 | £3 891 463 | £4 022 458 | £4 837 324 | £3 421 179 | £3 461 162 |
| Trade Creditors Trade Payables | £924 162 | £1 044 388 | £1 788 633 | £1 656 495 | £2 573 790 | £2 256 375 | £2 279 116 |
| Other Creditors | £380 996 | £443 679 | £414 666 | £414 623 | £472 619 | £474 781 | £452 186 |
| Amounts Owed To Group Undertakings | £242 910 | £0 | £952 082 | £1 127 432 | £1 119 435 | — | — |
| Number Shares Issued Fully Paid | — | — | 5 000 | 5 000 | 5 000 | 5 000 | 5 000 |
| Par Value Share | — | — | £1 | £1 | £1 | £1 | £1 |
| Average Number Employees During Period | 89 | 89 | 108 | 119 | 110 | 102 | 106 |
| Frais administratifs | — | — | £80 000 | £80 000 | £95 000 | £95 000 | £95 000 |
| Accrued Liabilities | — | — | £177 506 | £215 066 | £197 250 | £202 430 | £201 895 |
| Accumulated Depreciation Impairment Property Plant Equipment | £0 | £1 010 030 | £1 070 933 | £1 112 821 | £1 235 981 | £1 414 919 | £1 517 801 |
| Additional Provisions Increase From New Provisions Recognised In Profit Or Loss | — | — | £-5 714 | £-25 437 | £38 234 | — | — |
| Amounts Owed By Group Undertakings | £0 | £41 189 | — | — | £0 | £562 406 | £346 734 |
| Amounts Recoverable On Contracts | — | — | £660 860 | £400 592 | £551 549 | £763 450 | £1 085 431 |
| Applicable Tax Rate | — | — | £19 | £19 | £19 | £19 | £25 |
| Audit Fees Expenses | — | — | £11 875 | £13 125 | £13 100 | £12 800 | £13 440 |
| Bank Borrowings Overdrafts | £0 | £39 512 | — | — | — | — | — |
| Bank Overdrafts | £0 | £39 512 | — | — | — | — | — |
| Comprehensive Income Expense | — | — | £726 332 | £816 468 | £747 027 | — | — |
| Corporation Tax Payable | — | — | £141 207 | £141 960 | £170 387 | £144 193 | £168 651 |
| Cost Sales | — | — | £9 012 276 | £8 612 823 | £7 856 576 | £8 509 020 | £9 935 807 |
| Current Tax For Period | — | — | £141 207 | £141 959 | £170 387 | £144 193 | £168 651 |
| Deferred Tax Expense Credit Relating To Changes In Tax Rates Or Laws | — | — | — | — | £0 | £28 407 | £-18 591 |
| Depreciation Expense Property Plant Equipment | — | — | £247 432 | £285 339 | £269 807 | £280 320 | £263 318 |
| Disposals Decrease In Depreciation Impairment Property Plant Equipment | £146 031 | £92 946 | £166 459 | £227 919 | £157 160 | £84 380 | £204 954 |
| Disposals Property Plant Equipment | £182 679 | £101 980 | £199 547 | £231 337 | £166 584 | £86 467 | £223 377 |
| Dividend Recommended By Directors | — | — | £400 000 | £400 000 | £400 000 | £425 000 | £750 000 |
| Dividends Paid | — | — | £400 000 | £400 000 | £400 000 | £425 000 | £750 000 |
| Dividends Paid On Shares Interim | — | — | £400 000 | £400 000 | £400 000 | £400 000 | £425 000 |
| Finance Lease Liabilities Present Value Total | £25 834 | — | — | — | — | — | — |
| Finance Lease Payments Owing Minimum Gross | £27 057 | — | — | — | — | — | — |
| Further Operating Expense Item Component Total Operating Expenses | — | — | £80 000 | £80 000 | £95 000 | £95 000 | £95 000 |
| Future Finance Charges On Finance Leases | £1 223 | — | — | — | — | — | — |
| Future Minimum Lease Payments Under Non-cancellable Operating Leases | £328 800 | £248 800 | £80 000 | £950 000 | £855 000 | £760 000 | £665 000 |
| Gain Loss On Disposals Property Plant Equipment | — | — | £60 829 | £15 879 | £34 481 | £30 377 | £20 124 |
| Gross Profit Loss | — | — | £4 601 292 | £4 620 966 | £4 733 674 | £4 714 288 | £4 929 689 |
| Increase Decrease In Current Tax From Adjustment For Prior Periods | — | — | — | £-30 031 | £-49 789 | £-887 | £468 |
| Increase From Depreciation Charge For Year Property Plant Equipment | £264 598 | £279 340 | £285 339 | £269 807 | £280 320 | £263 318 | £307 836 |
| Interest Expense On Bank Overdrafts | — | — | £8 | — | — | — | — |
| Interest Expense On Loan Capital | — | — | — | — | — | £0 | £6 |
| Interest Payable Similar Charges Finance Costs | — | — | £8 | — | — | £0 | £6 |
| Operating Profit Loss | — | — | £979 863 | £859 382 | £911 324 | £926 137 | £772 331 |
| Other Deferred Tax Expense Credit | — | — | £49 545 | £-5 714 | £-25 437 | £38 234 | £20 927 |
| Other Interest Receivable Similar Income Finance Income | — | — | £3 817 | £3 195 | £305 | £2 430 | £33 841 |
| Other Operating Income Format1 | — | — | £0 | £224 883 | £60 575 | — | — |
| Other Taxation Social Security Payable | £438 077 | £439 588 | £417 369 | £466 882 | £303 843 | £343 400 | £359 314 |
| Pension Other Post-employment Benefit Costs Other Pension Costs | — | — | £125 897 | £150 644 | £163 399 | £161 540 | £175 869 |
| Prepayments | — | — | £135 478 | £126 481 | £181 768 | £188 836 | £204 169 |
| Profit Loss On Ordinary Activities Before Tax | — | — | £983 672 | £862 577 | £911 629 | £928 567 | £806 166 |
| Property Plant Equipment | £77 518 | £494 136 | £673 209 | £594 364 | £451 230 | £508 594 | £610 276 |
| Property Plant Equipment Gross Cost | £0 | £1 486 263 | £1 665 297 | £1 564 051 | £1 744 575 | £2 025 195 | £2 483 884 |
| Provisions | — | — | £105 563 | £80 126 | £118 360 | £139 287 | £219 330 |
| Provisions For Liabilities Balance Sheet Subtotal | £88 437 | £70 785 | £111 277 | £105 563 | £80 126 | £118 360 | £139 287 |
| Social Security Costs | — | — | £316 838 | £357 602 | £334 239 | £366 637 | £396 686 |
| Staff Costs Employee Benefits Expense | — | — | £3 575 576 | £4 051 041 | £3 875 865 | £3 855 376 | £4 334 158 |
| Tax Expense Credit Applicable Tax Rate | — | — | £186 898 | £163 890 | £173 210 | £176 428 | £201 542 |
| Tax Increase Decrease From Effect Adjustment In Research Development Tax Credit | — | — | — | £0 | £-27 861 | £-17 918 | — |
| Tax Increase Decrease From Effect Capital Allowances Depreciation | — | — | £539 | £867 | £-2 447 | £-10 300 | £-878 |
| Tax Increase Decrease From Effect Expenses Not Deductible In Determining Taxable Profit Or Loss | — | — | £3 315 | £1 519 | £2 048 | £5 810 | £7 505 |
| Tax Tax Credit On Profit Or Loss On Ordinary Activities | — | — | £190 752 | £136 245 | £95 161 | £181 540 | £190 046 |
| Total Additions Including From Business Combinations Property Plant Equipment | £186 994 | £270 471 | £239 582 | £130 091 | £347 108 | £367 087 | £682 066 |
| Total Borrowings | £25 834 | — | — | — | — | — | — |
| Total Current Tax Expense Credit | — | — | — | £141 959 | £120 598 | £143 306 | £169 119 |
| Trade Debtors Trade Receivables | £1 865 061 | £2 298 288 | £2 711 151 | £2 414 620 | £2 443 289 | £2 171 031 | £2 164 352 |
| Turnover Revenue | — | — | £13 613 568 | £13 233 789 | £12 590 250 | £13 223 308 | £14 865 496 |
| Wages Salaries | — | — | £3 132 841 | £3 542 795 | £3 378 227 | £3 327 199 | £3 761 603 |
