Just to go with what most other people seem to be saying, feed your baby where you like, baby rooms are often changing rooms and stink of dirty nappies, nobody wants to sit in them let alone eat their lunch in there!
If you try to be discreet, say by trying to cover the baby up, this usually brings more attention to it so just relax and get on with it.
People are can be so oblivious that they will touch the baby, not even realising you are feeding!
I've bf in public loads of times and never had so much as a look never mind any comments, negative reactions are the execption so please don't worry.
If someone does ask you to move just refuse, what are they going to do, pick you both up and throw you out?
If someone is complaining about you bfing they should be asked to move not you, why should your baby have its feed interupted?
And have you seen the breastfeeding manifesto? If you are worried about your legal write take a look and see if your MP has signed up. A few of us locally have been pestering our rather lazy MP and she has eventually signed:
[http://www.breastfeedingmanifesto.org.uk/]
Good luck with whatever you decide, I hope it works out for you.