i've used halfords
(bidston moss one) in the past just for a basic gear set-up and they managed to charge me £35 for the privilege of messing everything up more than it already was, which was annoying.offtherock cycles
in wallasey are good lads, more suited to mountain bikes i think though, but they get the job done promptly and at a good price.Birkenhead Cycles
i've heard are good, but i haven't used them so can't comment.
i've just got my new bike from cyclehouse/cheshire oaks cycles
and took it in the other week for it's 6-8 week service and they were brilliant, but i can't comment on their prices, my service was the free one.Evans Cycles
i've also heard very good things about, they're who i'll be using in future. Here's their price lists CLICKY