vickster - i don't know how to fix or service my bike and currently don't have the time or inclination to do so. so i'm taking it for a service this week (after about 800 miles in the last 2 months), mainly to ensure it is in decent working order for my tour at the end of the month. it might be a waste of £45, but it might not. but it gives me peace of mind that it's all checked out. the local bike shop are excellent. i would change tyres after 1500 miles personally - i'm sure you can get a lot more out of them, but again, it's more important to me to try and avoid loads of punctures on old tyres! hopefully someone who knows what they are talking about will offer an opinion!