As said just buy some spring clamps and do it yourself, it's not hard at all, infact there's a guide in the wiki section. £10 for some spring clamps is better than £120 for someone else to do it, which quite frankly is a fucking rip off (with labour at roughly £30 an hour it's not going to take them four hours when they have proper tools when it's possible to do in 2-3 hours with basic tools), plus then you have spring clamps incase you or your mates ever need some. It will take around 2-3 hours altogether depending on how stiff some of the bolts are, the back can be awkward to get to but it's a simple job. Along with the obvious top mount bolts there's just one bolt on each side on the back and two each on the front.