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When I was looking at data SIMs in Portugal (where you don't need to register SIMs, which is handy), I read that some networks rounded data sessions up to the nearest MB, but it wasn't clear what constituted a data session, so if you've got apps polling for updates every hour, each one could waste almost a MB each time, eating up 700MB of allowance each month on top of your actual usage.
Wouldn't be surprised if UK networks were similarly fucktardy.
I'll be on a bike for 16+ hours a day and eating/sleeping the rest. I don't think I'll have much time for streaming porn so should be well under the 12gb although Three fucked me last time and said I'd hit the limit even though when I rang to cancel they said "oh no you've got loads left". Yeah, well it didn't fucking work Montenegro to Turkey so do one.