If you receive payment of your benefits on flexible retirement, then your benefits will not be subject to reduction or suspension for re-employment whilst you are in a job with the employer that allowed you to take flexible retirement.
However, if you leave and are re-employed in local government or by an employer who offers membership of the LGPS and part of your pension in payment is in respect of pension you built up prior to 1 April 2014, you must tell the LGPS fund that pays your pension about your new position, regardless of whether you join the scheme in your new position or not.
They will let you know whether your pension in payment is affected in any way.