I'd agree with going to an LBS for work done. I contacted them about the derailleur and although they didn't have a new bike they did have the mech in and would fit it when I got there.
They didn't have one when I got there so took one off the display model. After fitting it and testing a few times I took it home. I didn't have much faith in the lad who fitted it but it was late and I tghought I could set up the gears myself.
I rode into work the next day and it wasn't right and was making a catching noise, I assumed the front derailleur wanted adjusting. When I looked when I got to work he had threaded the chain around the mech incorrectly and was rubbing on the outer bracket.
I must admit that is one thing I didn't look for when I took it home. The chain isn't damaged but it has worn a groove in the bracket which is going to rust. i stripped it and put it the right way round and it was ok. Unbelieveable.
I have contacted the customer services now to have the right mech sent to the Glossop store and have it replaced and that I don't want to go back to the original store. It is only a little groove but thats not the point, I also said I want some compensation for the p**s poor service I have recieved although I am not holding my breath.
On a brighter note, I set the bike up myself last night and this morning clocked up a PB of 20.17 on the commute to work.