W140 misfire; Mobile Mercedes STAR diagnostics in Cheshire?

[ajmcampbell]

Having a spot of bother at the moment in tracking down the source of a suspected misfire on my 1996 W140, which started to play up suddenly on Friday. I could do with a full STAR report to see what's happening. However, I'm struggling to find somebody who can do this. The car is at my parent's place in Tarporley, and I'm reluctant to drive it for fear of lunching the Cat. by pumping it full of unburnt petrol. Therefore, i wonder if anyone knows of a reliable mobile STAR diagnostician in the area?

Many thanks in advance,

Alex