OK, my fault really but...
I rather stupidly left my mobile at my brothers house last night when I was there to "baby" sit. I'm not meeting up with Nadine again until tomorrow but figured I'd simply pop to the shop today and get a pre-pay SIM for my old mobile and use that for today and tomorrow, esp as I'll need the phone anyway when my niece arrives for a few days over Christmas so she doesn't use her German mobile and she's planning on spending a day or two mooching about London and will need to be able to contact me.
But having had a quick look on the internet it seems that all prepays for smart phones that use data only offer "monthly" prepays. So for £10 I can get a SIM that has data, minutes and text messages which is great, but they only are valid for 30 days - so (if I understand it right) whatever I don't use up in those 30 days I lose and I then I need to get another 30 day SIM package. All I need / want is something that I can use until the credit runs out and then top up - I don't want another set monthly cost I don't really need
I'll walk up to car phone warehouse shortly and see what they have on offer - rather annoying really