ToyoSport isn't far from me and it is just a huge warehouse full of car "tuning" parts.
There's about 10 guys work there most with a pretty poor grasp of English but their English is better than my Chinese.
There is one fella in the office who speaks very good English and he's the one you usually deal with when you go in there.
You can buy GT30 copies for a £150, who knows how long they'll last but you could carry a spare at that price (and they have a better finish than the current BW EFR range )

Rich