If you leave your employment, you are aged 55 or over and have at least 2 years of LGPS membership you have a right to apply for the release of your pension benefits without the need for your employer's consent. This process applies to active scheme members who are claiming their pension on voluntary retirement grounds.
If you are not intending to leave your employment but you would still like to claim your pension then you may be interested to know about Flexible Retirement.