Good advice from Waterfall - invest in shoes as these can be worn in the long term. Wrap dress could also be wrapped tighter as you lose, so may be worth paying for a semi decent. Isabella Oliver? M and S, Next and Dotty Ps (all of which will have some people flinging up their arms in horror...) do cheap suits/jackets and could be worth checking out if you just want something for the short term.
Shopping was a disaster. There is nothing so depressing as a seeing yourself under flourescent lights and from all angles when you've just given birth.
However, my mum has dug out a dark pink Hobbs Jackie O style suit (shift dress, neat little jacket) that fits me perfectly, I have some killer shoes from the last time I went back to work (black snakeskin pointed stilletoes) and I am going to treat myself to a nice handbag
Thanks for the inspiration, I'll be hunting down more wrap dresses and pencil skirts if I do get the job.