This helicopter is still at the very same breaker's yard, although moved approx 10 metres from its porch-top location. Check Google Maps for postcode TW16 6AX and go a bit south-west of where Google puts its red pin along Fordbridge Road and you'll soon spot the breakers yard using satellite view. Then put your little orange man in the road outside to get Street View and you'll see it.
This was one of six Adams-Wilsons known to have been in the UK and was built around 1966 by the Zabel family in the area of Canewdon, Essex and did undertake tethered flights (photos exist in my loft!) but proved unstable and it has been at Sunbury since around 1968. None of these six were registered. I have further notes somewhere, but there was one built by a Mr Purser in the Birmingham area and another by a postman in Leicester.
A seventh helicopter of very similar format was registered G-ASDF as the "Edwards Gyrocopter". It was definitely a helicopter, and perhaps registered by Major Neville Edwards as a gyrocopter as it was a rework of his Bensen B7 G-ARUN. As G-ASDF, this Adams-Wilson style helicopter flew 200-300 hours with Edwards while he was stationed at Brompton Barracks in Chatham with the Royal Engineers, and he was for a few years quite serious about creating a single seat helicopter for the Army which could be towed behind a vehicle. It never flew outside the Barracks, though, but I do have photos somewhere of it flying, and also it being trailed behind his car. In more recent years it was restored by Cotswold Aircraft Preservation Group and is now in a private collection in Herefordshire.