My sons peugeot 206 05 reg Drivers seat is stuck i forward position?

The Drivers sit is stuck in forward position having let friends out of car.He was unable to get the seatback into the upright position and was unable to drive so we had RAC recover vehicle and bring him home. Him and his friends tried to pull seat into upright position trying handle etc. Nothing worked. The levers are in upright position on both sides of seat which you would expect if seat was upright, but looking at mechanism under cover of back of seat positioned in position you would expect for seat to be positioned down. The leavers are lose , appear to be coming away from seat and do nothing. Any ideas?