Filling in the gaps only?
Are you guys over in the UK that awash in free hotspots which your phones automatically connect to and which work, that you can use cellular data only to fill in gaps?
Over here, in geek central on the east coast (Cambridge MA, right near MIT)...
60-75% of the AT&T wifi hotspots that my phone automatically connected to didn't have any connectivity forcing me to turn off autoconnect (since it won't fall back to 4G when connected to an AT&T notspot)
Almost all of the non-AT&T free wifi hotspots require you to clickthrough a terms of service page. Unfortunately, about half of these pages are designed for non-mobile browsers, and even on my galaxy note, the page is unpleasant to work with. I encountered one that just redisplayed the clickthrough agreement, regardless of how many times I clicked through it. That tech that's going to be in the new ultrabooks to automatically log into these cannot come soon enough. Worse still, some of these hotspots require a login from the cashier in order to connect, some have timelimits. And THEY ARE ALL SLOWER THAN MY CELL CONNECTION!