Does anyone know how much it needs & is it fairly simple to change?

Does the box have a sump plug that it drains out from etc?

About 2.3 litres.

plug to drain, but always make sure you can free the filler plug FIRST! as if you drain it and get stuck with the filler plug............ dry box, and your going nowhere

Cheers guys, nice 1.

oh and use dealer oil, using your reg for ref. They dont like you putting exciting oils in them, they hate em

just changed the gearbox oil at weekend, bought oil from dealer, tell them Reg no. and chasis no., 2L needed. Surprising cheap, around 6.5 pounds each. As Loft said, open fill plug first, them drain plug. Use a pump fill the box or a long hose somehow from top of engine bay. Then tight the plug at 35nm.

My car is 05reg 1.6fsi 5 speed box, dealer says capacity 2L, I only drain 1.8L out. So contact local dealer, you will get capacity of box and right oil.