You might find these two sites useful in setting your bike up: one, two.
Did you get some Proofide/dubbin for your saddle? The oft quoted advice about applying your chosen saddle treatment is "once a day for a week; once a week for a month; once a month for a year; once a year for life."
Only a small amount should be applied, too much will cause a soft, saggy saddle: a generous finger-dab on a soft cloth.
For what are you being charged £150? I might be missing something, but at most I'd have thought you'd need two chainrings and a front derailleur plus no more than an hour's labour.
Veloce front chainset 50/34
I looked on fleabay and the cheapest was £110 so thought bugger it, I'll get it fitted for £150 and I'll have someone to shout at if there are any issues.
Need the brakes looking at too, getting noticeably harder to stop at the bottom of steep hills

Bought the proofide, didn't realise I need to add that much to start with, I'll give it another rub when I get home.
Great links btw, thank you!