My R22 had its annual and C of A a few weeks ago. The bill was just under £6000 including a new engine oil cooler baffle at £480 plus £500 labour to replace it. The original one was apparently cracked. The items that did irritate me were a new pilots operating handbook and a new first aid kit, neither of which I had asked for. The labour rate was £55 per hour and the job took about 3 weeks in total.