Data SIM in United Kingdom

Does anyone know of any decent SIMs that are available for hobbists?

Basically I just want a Pay as you go SIM that does low-volume data at rates that aren't crazy per-day (I don't mind about crazy per-MB rates :) ). I won't use it every day (so I don't want to pay monthly), but it'd be nice if it didn't cost me loads when I did use it.

Most M2M sims don't operate on PAYG but do allow you to cancel after a month. As your in the UK try http://m2msecuritysims.com I'm using thier SIMs to talk from RPI to a cloud end point. They start at £1 per month for 1mb.

I've just got some sim's from http://konekt.io you don't need thier hardware! Thier SIMS start $1 per month for 1mb. What's more you get a full SIM management and a simple API to post data to thier cloud service & a forwarding service to your cloud endpoint. They catter for both pro & makers. I'm planning to move all my projects to thier platform over time.

http://www.carphonewarehouse.com/sims/pay-as-you-go/pay-as-you-go-sims most come with call minutes and texts as well but fairly cheap.

GiffGaff do SIM deals with data only and can be topped up or contract starting at £5 for 500mb.

Thanks for the info! I've been trying to avoid pay monthly, but at $1 per month that's actually looking like the cheapest option (as a lot of the others need a £10 initial top-up anyway!).

@IanWatkins I looked at GiffGaff years ago very narrow offering then. Is there a time limmit on the 500mb normaly these only run for a month on PAYG? but if it lasts until all used it would be a great solution for makers & devs.

@LawrenceGrif I don't know, never used them. Most do have time limits though.