pud - Ah, so that's what kit is all about. Spot the lady with no job hence no maternity leave knowledge.
We've already got the back carrier and are impatiently waiting for dd to be big enough for us to be able to use it! Yomping is what family worse do best 
Eig - yup, get her used to a bottle asap as the longer you leave it the harder it will get. Mini-worse was a right little madam about it to start with, although we are 99% there now. Dr Brown's are for some reason preferred by a few babies I've come across who've started late, and medela is also good if you want to switch from boob to bottle and back. The medela calma teat works in the same way as the breast i.e. milk only flows when the baby makes a vacuum with their tongue and sucks.
You can get both from Boots on-line. I don't know about London stores, but out here in the sticks nowhere stocks either of those.
Re switching over to formula I'd recommend you start a couple of months before you go back so that you can do so very gradually. I have dd on two bottles now, started on one, and will put her on three in another week or so.
Have you thought about expressing so that you can give her some bm in a bottle? It would get her used to a bottle more quickly without over doing the formula.
When you start to wind down your milk you will get a little uncomfortable, and it is tempting to put the baby on both boobs to take some of the pressure off. Don't, express off and bin some of the watery fore milk first to make sure your dd has a balanced feed. I didn't do this to start with, and the excess lactose caused some very explosive watery green nappies. Not pleasant for either of us.
I'm wanting to get my body used to making less milk, so often express half a feed, and mix with formula, or give dd half a bottle and then swap her back onto me. That works really well.
Formula is much harder to digest, so there is an adjustment period, and formula nappies are really disgusting if you are used to bm ones.