The aircraft had previously been parked for maintenance in a relatively confined area between two hangars. It was close to and facing a fence, in a position which did not allow sufficient room for a U-turn to taxi out. The grass surface was boggy after rain. The pilot sought assistance from a person in an adjoining hangar but there was no suitable tow bar, and the two could not manhandle the aircraft. The pilot then reversed the aircraft out until the wheels reached a small ridge at the edge of the taxiway. From this position there was then room to make a U-turn to the right. The pilot initially turned the aircraft slightly left to give himself more room before turning right. However, when he applied right rudder and brake, the aircraft failed to respond and continued ahead, sliding on the slippery surface. It then collided with a brick wall, damaging the nose cone and left wingtip and causing considerable damage to the wall.