If you want a go yourself, there might be some courses in your area, I've seen a few advertised around here.
I'd agree with others, I'd expect a £200 - £250 bill, good news is they seem to have covered all the stuff that regularly needs it, so it ought to be good for a long while.
Another advantage of DIY is a LBS might replace something that a home mechanic might get some more use from, that isn't a criticism, they want you to be happy and not need to come back a month later, it just doesn't always represent the best value. Likewise, labour is such a big part of the bill (Understandably, I doubt anyone is getting rich) it's often more economical to replace than to service. I think I do a better job than an LBS, not because I have the skills, but because I'm happy to spend an entire day getting something just right, even if they did it in half the time, no one would want the bill.