In 1989 Britannia sent the 12 of us on the course to Shannon for the best part of a week with 6 instructors, a pair of students each. Stayed at the Shannon Shamrock. We left and returned to Luton.
Other places I've been for circuit training are EMA, BFS with ABCarriers, Ostend and some airfield in Denmark that I can't recall (LR 60), don't even know if I logged it! For the 767 at Brits we did Zero Flight Time training. Experienced 737 pilots (1500 hrs?) could go straight from the sim on to passenger carrying aircraft. No problem at all.