I did my ICAO to JAR at BCFT in Bournemouth. Nice part of the country and as a pilot from the Southern Hemisphere, I did appreciate the milder weather too.
In regards to the exams, as you have to do all 14, it is not really a conversion.
I have also dealt with Bristol Ground School and would happily recomend them for distance learning.
PM me if you need any further info.
Good luck