Finding accomodation is no problem as long as you do it in advance. Bristol GS has a list of recommended places to stay on their site.
For the recommended list...
Bristol.gs
http://www.bristolgroundschool.eu/downloads/accom.pdf for the full list
As far as transportation, to get to Bristol, you can take a plane. Then take a taxi from the airport to Cheddar.
From Cheddar to Gatwick, there is the Bus, Train, or you can hire a car and drive.
Lots of foreigners in my class, Norway, Sweden, France, Italy, Russia, Hong Kong, Nigeria, Morocco, and more. It wasn´t too difficult for them doing the Bristol route, figuring out accomodation and transportation. BGS also has their own forum for support and you can arrange transport with other students. I personally recommend it.