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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.
hippy-
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.
Emyr
Unlimited data in the UK doesn't quite translate to unlimited overseas with 3, it caps out at 12GB (admittedly that's a fair amount but I have got near it a few times).