Garage Recommendations in West London/Middlesex

[98C4S]

Can anyone help with some suggestions for value for money Mercedes specialists in the west London/Middlesex area that can help with the family S class (2003 S320CDi).

It needs some electrical gremlims sorted, and some suspension components changing.
It also has loss of power, its slow to accelerate, might be the box or turbo.

Any suggestions for any company or person who won't bend me over!

thanks in advance