Thanks to everyone for your advice.
 b1k3rdude - this the second set and both sets have been rebalanced.
I dont usually let go of the bars but was just testing, stupid i know :-(
As far as tyre pressures go, well went to see a mechanic freind of mine, he checked tyre pressure and found the front to be 5psi to soft and the rear 5psi to hard. Thought the tyre shop would have known the correct pressures!! also, he released the spindle clamps on the front wheel, bounced the forks to reset the spindle and retightend them..Hey presto- no wobble.  :-) Happy now, will let you know how the tyres go ....