If you can make it as far as Kidlington or Wellesbourne, try
www.ontrackaviation.com . They are approved as a FTO to conduct MEP training and would probably be able to design a course specifically for your needs. Normally I think that they use a Seneca; don't know whether they could source a twin-Comm for you.
I have no financial interest in this company and am merely answering your query. However, I do know that they have a good reputation for sound instructional standards.