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You just need a single cross-head precision screwdriver, something like this:
http://www.maplin.co.uk/6-piece-precision-screwdriver-set-223453?tabid=1&criteria=usb&c=so&u=strat15
Before you buy a set, check that the cross-head is small enough to fit the screwhead. No need to ship from the states.
You call that a "cross-head" screwdriver in the UK? In the States, it is known as a Philips head screwdriver. (In Japan, it is called a "plus driver" !) And people say we use the same language....:p
Actually the OP needs a #00 size, cross-head, or whatever you want to call it, for the screws on the back of the MBP. Careful there, they are really small, and prone to rolling off the desk and hiding in the rug!
Also a Torx 6 screwdriver for the nuts or lugs on the side of the HD. :cool:
 
Yeh, it's called a philips here too, but Philips is more of a brand that has given it's name to the product, (like hoover). For the sake of argument, I said cross head :)

You're right about the torx, forgot about that bit - a half decent precision toolkit will have one of those in too.

A great tip I got from some website that takes electronics to pieces for NOT losing screws is: get a length of electrical tape, stick one end to the other so that you get a continuous loop of sticky and put it on your desk. Then you just place the screws on the tape in the order you get them out. Works like a charm.
 
Always have a few spudgers on hand.

Agreed. The spudger OWC throws in with their kit is pretty good. It helped me get my old RAM out of my MBP the first time I swapped modules. They wouldn't slide out very easily, nor could I get a good grip on them to pull them out. The spudger helped me get 'em out with hurting them.
 
Spudgers are man's best friend for electronics as you will almost always need some prying force or pressure force and without a spudger, people use a screwdriver and it leaves scratches which make bunny cry.
 
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