510,
I don't know. I have the Canadian ATPL with a little over 4000 hours, of which 3500 hrs is in M/E turbine 2 crew airplanes, They (caa) still said I needed to write the exams (i think 14 in total)and then do a ride. They did however suggest I could do the ride on the sim, although I really don't know how this would help.
I looked at the Bristol course and it seems the way to go. A couple of friends over their said it was also well regarded.
How much do you figure the conversion will cost you?