| 1837 - 1851 | 1852 - 1946 | ||
|---|---|---|---|
| I | London; Middlesex | 1a | London; Middlesex |
| II | London; Middlesex | 1b | London; Middlesex |
| III | London; Middlesex | 1c | London; Middlesex |
| IV | London; Surrey | 1d | London; Kent; Surrey |
| V | Kent | 2a | Kent; Surrey |
| VI | Bedfordshire; Berkshire | 2b | Hampshire; Sussex |
| Buckinghamshire; Hertfordshire | 2c | Berkshire; Hampshire | |
| VII | Hampshire; Sussex | 3a | Berkshire; Buckinghamshire; |
| VIII | Dorset; Hampshire; Wiltshire | Hertfordshire; Middlesex; Oxfordshire | |
| IX | Cornwall; Devon | 3b | Bedfordshire; Cambridgeshire; |
| X | Devon; Somerset | Huntingdonshire; Suffolk; | |
| XI | Gloucestershire; Somerset; | Northamptonshire | |
| Warwickshire | 4a | Essex; Suffolk | |
| XII | Essex; Suffolk | 4b | Norfolk |
| XIII | Norfolk; Sufflok | 5a | Dorset; Wiltshire |
| XIV | Cambridgeshire; Hertfordshire; | 5b | Devonshire |
| Lincolnshire | |||
| XV | Leicestershire; Northamptonshire; | 5c | Cornwall; Somerset |
| Nottinghamshire; Rutland | 6a | Staffordshire; Warwickshire; | |
| XVI | Oxfordshire; Staffordshire | Worcestershire | |
| Warwickshire | 6b | Staffordshire; Warwickshire | |
| XVII | Staffordshire | Worcestershire | |
| XVIII | Gloucestershire; Salop | 6c | Worcestershire; Warwickshire |
| Staffordshire; Warwickshire | 6d | Warwickshire | |
| Worcestershire | 7a | Leicestershire; Lincolnshire; | |
| XIX | Cheshire; Derbyshire | Rutland | |
| Flintshire | 7b | Derbyshire; Nottinghamshire | |
| XX | Lancashire | 8a | Cheshire |
| XXI | Lancashire; Yorkshire | 8b,8c | Lancashire |
| XXII | Yorkshire | 8d,8e | Lancashire |
| XXIII | Yorkshire | 9a,9b | Yorkshire |
| XXIV | Yorkshire; Durham | 9c,9d | Yorkshire |
| XXV | Lancashire; Cumberland | 10a | Durham |
| Westmoreland; Northumberland; | 10b | Cumberland; Northumberland; | |
| XXVI | Brecknockshire; Carmarthenshire | Westmoreland | |
| Glamorganshire; Herefordshire; | 11a | Glamorganshire; Monmouthshire; | |
| Monmouthshire; Pembrokeshire; | Pembrokeshire | ||
| Radnorshire; Salop | 11b | Anglesey; Brecknockshire; | |
| XXVII | Anglesey; Caernarvonshire; | Denbighshire; Flintshire; | |
| Cardiganshire; Denbighshire; | Montgomeryshire; Radnorshire | ||
| Flintshire; Merionethshire; | 11c | Carmarthenshire; Cardiganshire; | |
| Montgomeryshire | Caernarvonshire; Merionethshire |