Thank you so much for your help
Infact the rider of this bike is my mother, I'm so proud of her. She used to ride competitively in trials, and my father used to ride trials, sand racing and scrambles, obviously my mother being pit support, for most of the events
I am absolutely thrilled to find out what motorcycle it was....bad news for yourself is I have a full album of bikes used in competition, it seems that my father used to swop tanks, to keep the originals in good nick, so I have no logos to go on....I will try and find out more about the history of this particular bike, it was fairly obviously a favourite of my mothers...