new2350z

Anyone reccommend good indi garage in N. ireland - greater Lisburn/Belfst area preferable but will travel further if means getting good service. My 350 is due its 27k miles service so P3 I think - Nissan dealer is charging £250 - does that sound expensive? What is the average cost for a p1/2 and 3 - my car has been serviced on mileage rather than age (its 03) so I think the previous oner done a full service @ 18kmiles 2 years ago - thiswill be its first service since then under my ownership. Any advice much appreciated...