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Heading to UK for 6 weeks, would like a PP SIM for the iPad - data only as will have phones anyway. What's best and where do you get them.
Ta
I've just bought a Three data only SIM card, 3GB valid for 3 months from first use (no registration etc. just pop it in and go). Sub £12 from Ebay if you can get it ordered to a UK address.
Otherwise Giffgaff - £7.50 for 1GB valid for 30 days (or £5/500mb).
Giffgaff uses O2's network which isn't as good for data/3G coverage IME (YMMV). You'll also have to register it and top it up.
Edit:
[url= http://www.amazon.co.uk/Three-Mobile-Broadband-Preloaded-Devices/dp/B003Z0T3X2/ref=sr_1_sc_1?ie=UTF8&qid=1375668546&sr=8-1-spell&keywords=Thee+data+sim+3gb ]£12.06 from Amazon[/url]
[url= http://www.ebay.co.uk/itm/Three-3-3G-SIM-Ready-to-go-Mobile-Broadband-3GB-Preloaded-Data-Sim-/230997747622?pt=UK_Mobile_Home_Phones_Sim_Cards_CV&hash=item35c889e7a6 ]£11.90 from eBay[/url]
The 3 network deals from Amazon or eBay linked to in the previous post are the way to go. Just check that 3 has coverage in the areas that you intend to visit [url= http://www.three.co.uk/Support/Coverage ]3 UK Cover[/url]
If you are likely to use more than 3GB it is cheaper to buy 2 SIMs as it costs £15 to top up with 3GB.
I used this when visiting the UK earlier this year and it worked really well.