As mentioned before the tick seems to have disappeared completely (hopefully for good) she was having a bad case of the shakes at around 70mph but took her to a local garage for a full service and no problems were found apart from the wheels needed balancing.
just came back from a 1000 mile round trip to Cornwall (love those hills) and gave it a bit of welly there and back but the shakes are no more and shes rumbling along nicely.
best regards pugsy.
P's if you live near royston herts can recommend windmill garage as they do a good job and don't rip you off.