Hi Trevor,
Its a difficult question that one, you are in one of the few black holes of regions or technical guys that we have available around Evesham.
You are sort of on the edge of three different regions, but all are quite a stretch away from you.
I would suggest first stop would be to some of the regions, Coventry and Hinkley, Three Counties (Hereford), Wiltshire or even Bristol. All are a trek from you, but you know your traveling preferences.
http://www.jec.org.uk/mag/je052014/#122
As Tony suggested Swallows do come well recommended, but there may be one or two a little closer.
BrakeBuster if you read this, can you help, your not a million miles away from Evesham are you? (I think).
Regards
James