Update: I rang around all the tyre fitters in the area and they all said they couldn't do it. ( ummm, I bet if I bought 4 new tyres they could) anyway, I rang the BMW stealers in Peterborough and they said they could get a socket for £40 but I would have to bring the car in before they could order it as there are over 40 different ones!!
I got home from work and I decided to have another look.......hey presto I found it lodged in the battery compartment. The thing is only the size of a wine bottle cork and they want £40!!!!!!
Great I thought, I'll change them now...yup you guessed it, no bloody wheel wrench...DOH!! Oh well, off to Halfrauds tomorrow to get one....bugger.