Thanks IcePack - That's what I thought. I had the car in at a local Classic car specialist for MOT and mechanical check over ahead of a big road trip this summer. They advised me the wheels needed balancing - I asked for weights on the inside of the wheels but they assured me that they would not balance that way - the only way to balance them was weights on the outside. I went to collect the car yesterday and found they have removed the balance weights that were on the inside of the wheels but left the wheels with no balance weights! ie they have unbalanced the wheels!!!
I am now reluctant to take the car back there for them to rectify it. Hence looking to find a reliable company to do this for me.