Well I went to TFN and they were lovely 
Made me a coffee whilst they told me about basic bike stuff to reduce my numptiness and set up a turbo so I could have a pedal in the shop. Then I popped down the road and did a few spins round Sainsbury's car park to try out my favourite one.
So..........I HAVE A BIKE 

(well I don't actually have it yet....I've paid for it and am collecting it tomorrow with Mr Saffy and the bike rack!)
They knocked me £70 off and also threw in a helmet.
Running Rodent, I ended up going for a Giant Avail, which is a women specific one.
Red ones are always faster - fact! 
OMG I boght a white one 
p.s. I've called her Betty 