Reliable mechanic in East London - E17?

[Lexual]

Hi all,

My 2001 9-3 Aero gave up on me a week or so ago just before I went on holiday, it has battery life but just makes a loud ticking/knocking noise when I try and start, I'm guessing it may be either starter motor, di cassette or the crank position sensor...

Can anyone recommend someone who may be able to come to the E17 (Walthamstow) area and repair it on the spot? and be reasonably priced...

Thanks