These days I am rather well covered for data access whilst out and about. BT Wifi hotspots, free BT Wifi, Free O2 wifi and free "The Cloud" accounts usually have me covered but for those more remote locations, Samba was a godsend.
No monthly fee and a banked quota of data to rely on was a perfect solution, but ultimately not sustainable. I would look at prepaid if there was no expiry time so maybe I will see if that exists in the market.
Otherwise I will have to look at tethering as an option. My current GiffGaff 12 tariff does not allow it, so i would need to switch to the £10 package to open up tethering . . the sting in the tail? Doing this would incur a 1GB data allowance, down from unlimited . . .