2E+W+SThe following abbreviations are used in this Table:
| 1967 | = The Parliamentary Commissioner Act 1967 (c.13) |
| 1977 | = The National Health Service Act 1977 (c.49) |
| 1978 | = The National Health Service (Scotland) Act 1978 (c.29) |
| 1980 | = The Health Services Act 1980 (c.53) |
| 1987 | = The Parliamentary and Health Service Commissioners Act 1987 (c.39) |
| 1990 | = The National Health Service and Community Care Act 1990 (c.19) |