| Runs |
Wkts |
| 581 | 16 | Old Westminsters v Oundle Rovers | Vincent Square, Westminster | 2003 |
| 564 | 15 | Old Westminsters v Old Cliftonians | Vincent Square, Westminster | 1989 |
| 553 | 16 | Old Westminsters v Old Cliftonians | Vincent Square, Westminster | 1997 |
| 491 | 19 | Old Westminsters v Harrow Wanderers | Vincent Square, Westminster | 2008 |
| 480 | 17 | Old Westminsters v Old Alleynians | Vincent Square, Westminster | 2004 |
| 469 | 17 | Old Westminsters v Downside Wanderers | Vincent Square, Westminster | 1978 |
| 451 | 16 | Bradfield Waifs v Old Westminsters | Bradfield College, Reading | 1976 |
| 447 | 15 | Old Westminsters v Marlborough Blues | Vincent Square, Westminster | 2006 |
| 441 | 19 | Old Westminsters v Eton Ramblers | Vincent Square, Westminster | 1967 |
| 441 | 9 | Old Alleynians v Old Westminsters | Dulwich College Ground, Dulwich | 1998 |
| 427 | 20 | Old Westminsters v Rugby Meteors | Vincent Square, Westminster | 1973 |
| 425 | 17 | Downside Wanderers v Old Westminsters | Downside School, Stratton-on-the-Fosse | 1970 |
| 422 | 14 | Old Westminsters v Lancing Rovers | Vincent Square, Westminster | 1994 |
| 413 | 14 | Old Westminsters v Marlborough Blues | Vincent Square, Westminster | 1991 |
| 403 | 14 | Old Westminsters v Old Alleynians | Vincent Square, Westminster | 1999 |
| 387 | 11 | Downside Wanderers v Old Westminsters | Downside School, Stratton-on-the-Fosse | 1995 |
| 383 | 16 | Radley Rangers v Old Westminsters | Radley College Bigside Ground, Abingdon | 2007 |
| 379 | 17 | Old Westminsters v Shrewsbury Saracens | Vincent Square, Westminster | 1996 |
| 377 | 16 | Old Westminsters v Downside Wanderers | Vincent Square, Westminster | 2002 |
| 367 | 17 | Old Westminsters v St Edward's Martyrs | Vincent Square, Westminster | 2001 |
| 358 | 17 | Downside Wanderers v Old Westminsters | Downside School, Stratton-on-the-Fosse | 1982 |
| 358 | 12 | Haileybury Hermits v Old Westminsters | Haileybury College Ground, Hertford | 1983 |
| 352 | 18 | Old Westminsters v Oundle Rovers | Oundle School Ground, Oundle | 1970 |
| 350 | 17 | Old Westminsters v Old Whitgiftians | Vincent Square, Westminster | 1976 |
| 339 | 19 | Old Westminsters v Radley Rangers | Vincent Square, Westminster | 1980 |
| 321 | 10 | Charterhouse Friars v Old Westminsters | Charterhouse School, Godalming | 2000 |
| 321 | 12 | Old Westminsters v Old Brightonians | Vincent Square, Westminster | 2010 |
| 312 | 19 | Old Alleynians v Old Westminsters | Dulwich College Ground, Dulwich | 2005 |
| 310 | 19 | Old Westminsters v Uppingham Rovers | Vincent Square, Westminster | 1972 |
| 308 | 19 | Old Whitgiftians v Old Westminsters | Whitgift School, Croydon | 1993 |
