Duncan,
I just invested in a set of Cooper STT's from a guy in Wales. £99 a corner and £40 freight. Cost me another £40 for fitting and balancing at the local garage. These were 265/75/16 so a smaller size might be cheaper.
If you are interested PM me and I will give you their phone number. Great service and were delivered within the week.
I also have a set of GG's but one has a nick in the side wall so I am on the lookout for a replacement and have seen quite a few on a well known auction site, full sets at reasonable costs, worth a look.
Tommy