Have a look on e-bay as i have seen MB Kompressors come up quite regulary, most being new, most breakers I think would,nt split from the engine, but you could try, Dronsfields or Merc-man and see what they have to say. But do have the kompressor pt. no. to hand as the 230 engine i believe had several different ones depending on the platform they were fitted too.
Just found this one e-bay http://cgi.ebay.co.uk/MERCEDES-SUPE...14&_trkparms=72:1683|66:4|65:12|39:1|240:1318
There is also a complete engine for £695 if this one proves to be the wrong one.
If you have,nt got the pt. no. for the kompressor, i,m sure someone could look it up for you, but you will have to supply the full chassis number of the vehicle.
The only people i get to do my car are in the Southampton Portsmouth area, so probably to far from you, but i feel sure someone in your area will be on later to reccommend somewhere.