Thanks all, I have done some more reading up form the Easybuild website and elsewhere and I think I have a plan involving masking tap, scoring of lines and microstrip! Watch this space (though its likely to be next week before I attack the roofs again).
As a general rule most cheap Chinese figures look pretty rubbish and under scale, I did invest in a pack a while back and they'll be OK for filling busses/coaches but anything that is visible I'd give a miss and invest in more bespoke figures from the various supplier we have here. Having said that I spotted this set of figures on ebay last week while looking for something else, for just over 12 quid I thought what the hell, worth a punt. Well, I am rather happy with them, the handle for the jack was too short (I have extended this with a piece of 2mm rod) but with a few touch ups here and there I think they will look the part (Note car not included!!!).