Originally Posted by
chrissxb
easier: use
http://www.tgv-europe.com and chose great britain as your country of residence. you'll still be able to prepay your tickets and pick them up at a french rail station. price are the same iirc.
Thank you,
chrissxb 
I think I'm ok dealing with French via google translate (already got the price/itin). But voyages-sncf.com seems to only take 6 pax in 1 booking. Do you know if there's a way to do a group booking (11 pax) on the site? Do I simply make 2 bookings of 5 pax and 6 pax?