Thanks everyone. I've decided to go with the Continental Eco Contact 3 seen as they are very highly reviewed, I'm not prepared to skimp on tyres and they are the only contact between me and the road! I took a centre cap off one of the wheels (one of the things holding it on snapped off so if anyone knows where I can get replacements from that would be great - part no. 97BG-1000-EC - see photo) and now I understand that it is the locking wheelnut key. I'm arranging for all 4 tyres to be replaced at a local place for £180. Will ask them not to tighten everything too tight too. Cheers everyone
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