American or UK?
The UK ground exams were done with the late Sandy Thompson and the flying with Wyombe air centre who are now unfortunatly part of the Cabair group but dispite that they are still worth considering (at least for the moment).
THe American IR was with the Ann Arbour flight centre about 30 west of Detroit metro.
Both used the BE76 and were very good at the time.
It has to be said that two pre booked American training companys compleatly failed to come up with the goods on time, if I had not been working in the USA at the time I would not have got the rating. The guys at Ann Arbour were very good and well up to the job but about 50% more expensive than the headline rates seen in the UK flying mags.