Ahh yes, I thought as much!
I am actually looking for a new phone at the moment because my contract has run for two years. My current phone is a HTC Radar which has served me well. I have little money to spend on a phone, so am currently set on buying the Moto G. It's great value at <£160 for the 16GB model - Moto G 16GB Sim Free Smartphone - Black: Amazon.co.uk: Electronics
I did look at GiffGaff and going PAYG, but I don't really want to pay out for the phone outright. I can get the same phone for £10 with Orange and keep the existing contract. Although GiffGaff has a much better deal, I'm still probably going to stay with Orange for the lower outright cost. It's a shame though, because Giffgaff have amazing deals... I may just get a SIM as a backup.