I used them when I had my first 156 about 5 years ago. I had a timing belt failure and took it there to get sorted. Cost £1900 for a top end rebuild
but most of that was covered by the warranty. Shortly after that the variator went, so they obviously didn't think to advise me to get that done while doing all the other stuff
Also about a year ago I had a Laguna and was on the lookout for another 156 and went to look at one at Lyles. The salesman couldn't give me a price for trading in the Laguna straight away so said he would get back to me. Suffice to say I heard nothing back so a few weeks later ended up going to Mango's to buy my present car (and spending an extra 2.5 K)
At one time they were the only alternative to Benfield in this area but they're not much cheaper than main dealer prices really.