If you were a member of the LGPS between 6 April 1978 and 5 April 1997, you paid reduced National Insurance contributions. You did not pay into the State Earnings Related Pension Scheme, or SERPS, when you were an LGPS member. The LGPS guarantees to pay you a pension at least as good as you would have received from SERPS. This is called the Guaranteed Minimum Pension or GMP.