Just read the Wikipedia article about him. It won't help find him now, but interesting stuff.
http://en.wikipedia.org/wiki/Brian_Hart
He supplied three engines to me or rather my sponsors and was always approachable and friendly at all times, as well as being completely trustworthy. If an engine was a good 'un he'd tell you, but he'd also tell you if it was a bitza. Respected him very much.