Got to agree with Sammy unfortunately. I tried to use them last year. I dropped off my headset and had a chat with a very friendly and helpful chap from the workshop who agreed to do some very minor repairs for a very low price. I came back to collect a few weeks later to find that no work had been done, and that they now wanted several hundred pounds to completely overhaul the headset. I declined, citing the verbal agreement we had, which they now had no knowledge of. I was told that they would not return my headset to me unless I paid the £30 (plus VAT I think) inspection fee.
So having agreed to shorten the downlead by a couple of inches to remove some cracked insulation, for a few quid, I was hit with a choice paying for a full overhaul, surrendering my headset and leaving it with them, or paying £30 for nothing at all.
Not impressed.