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I only know of this variety from Harrap's 'Orchids of Britain and Ireland'. To me, the picture there does not really correspond to your picture. What makes this 'belgarum'?
My Flickr photos...
I am afraid I was informed at the time of spottimg it by a so-called expert ,if it is not Belgarum ,I apologise .
He may well be right! I am just keen to know...in spite of calling myself 'ophrys', I have never looked at varieties within Bee Orchid!!
Lat/Lng: 54.1455, -0.1683
OS grid ref: TA197737