I do it myself, but including a new battery I would say 250/300.
Do you not think about doing it yourself. I have a diesel: change oil/fuel/air filter, change oil, change brake pads(depends on when they are worn),spark plugs(petrol), top up brake fluid(if its low, ur light is comin on so would assume you brake pads(should hear your brakes squeeking as well) are worn or need top up brake fluid), check battery water(top up if necessary), check coolant(top up if necessary, change it once every one/two years), and thats about it. Maybe some additional stuff like wiper blades, minor details etc and this stuff in a motor factors place could be all bought for 50 - 100 quid depend of course on what you are buying. A battery can be bought for 50 - 80 euro and just take out radio before hand.
Should seriously think about it, save you alot in a year and you know(for sure) whats going into your car - not saying they put anything bad in - if you get my drift!!!!
mayoman2