Regarding Multi Crew..... any multi pilot time will count if you are 1 of 2 pilots, even on a Gazelle. You need to get a letter written by your OC certifying thay you have x amount of Multi Pilot time and send it to the CAA when you get your Lic. You will get back a MCC, Multi Crew Certificate which will enable you to save wedge you would have had to spend on a CAA approved course.
Best of luck.