PaYG is pretty dear with data afaik.

I've just switched to PaYG as I'd ideally like to move to a Vodafone (yeah I know) £10/month 30-day contract. It should be possible to add data to this for ~£5/month, which would make it something like £15/month with almost no contract.

Many/most of the providers here offer decently cheap SIM only monthly deals, so that might be your best bet considering the price of PaYG.

Then again, someone else may know better. Anyone?