The Pilot was positioning G-CDFE to Weston Airport from EIMH to attend a briefing of crews participating in an airshow the following day. Shortly after take-off the weather en route deteriorated and the Pilot decided to return to EIMH. The wind slightly favoured Runway (RWY) 11 and he carried out a normal approach and landing. However, braking did not give the desired deceleration and the aircraft overran into the left boundary hedge at taxi speed. The aircraft sustained minor damage and the Pilot was uninjured.