There is a place calles radiator services, in city center,
018740626
The rad does be under a good bit of pressure, and if she does leak, or go suddenly, you could over heat and kill your engine!
So maybe worth sussing out the traders to see if there are any good deals going,
Or aren't the leggy rads the same as newage sti rads?? swap back to standard might be a cheaper option,
The Gobstopper runs a standard sti rad!!
Dan