bit annyoed as my (new) tyre keeps going flat, very slowly (few days to a week before it was noticeable). took the rhe wheel off yesterday and there is a medium sized nail near the middle of the tread. does anyone know which tyre places do repairs (just tyres, kwik fit, hi-q are near enough) and if it would be worth it? (tyre cost £60 ish, and is only a month old).