As a giffgaff user I've been posting updates on the O2 free wifi hotspot, and thought it may be useful to share with you.

The giffgaff link is here:
http://community.giffgaff.com/t5/Lea...e/td-p/1817935

BTW If you're interested in giffgaff but want a continuous service by monthly payment, from 20 June, giffgaff are offering exactly that.
Their recurring goody bag at £10 a month gives unlimited data and texts together with 250 call minutes (free to other giffgaff numbers)