Heard good things about the Parc MCC course. You get some good hands on flying using the type of SIM that many airlines use for their assessments.
I did mine with Jetlinx using BAs 757 full motion simulator at Cranebank. I found the course very helpful, and probably one of the most enjoyable experiences in my flying training career. The MCC really was hugely interesting, and it is a good bridge from the single pilot world we all come from.
I learnt loads, had a good time, and I even got my beer bought for me. What more can you ask for?