Hands too fat/sweaty/shaky to cut a normal SIM down to micro-SIM size? You can grab this micro-SIM cutter from Amazon for £1.95.
Comes with a couple of adapters in case you need to pop the resultant micro-SIM back in a normal-sized slot.
Delivery is 99p, making the total £2.94.
Sold by memorycapital.
(Thanks to Ballard at HUKD)