SRS Airbag light needs resetting, 2007 R56 MCS

[bollomatron]

Hello All..

Got a bit of a problem with My 2007 Cooper S R56:

I took the drivers seat out to repair some damaged leather.
Now that I have put it back in and reconnected the airbags etc the SRS airbag light is still on.
I have read in a few places that this requires the dealer or a special box to reset.
Now I know that if i take it to a Main Stealer they will charge me at least an hours rate, for literally 2 mins work.

Has anyone got any alternatives?

I have had a look and because mine is an R56 the magix box costs a fortune. (canbus apparently)
Anyone know of anyone is west london that could sort this a bit cheaper than a main stealer?

I would prefer to be able to it myself using a an ODB2 cable of some sort, but this seems to be hard to get hold of?

Thanks in advance

Alex