[OT] Prepaid mobile plans with data, possibly roaming

[Toby Wintermute]

Hello all,
I'm making a whirlwind visit to London and bits of Europe soon,
although with awfully poor timing, just missing YAPC:EU :(
Hopefully I'll manage to run into a few of you while I'm in London though.

The last time I visited, I picked up an Orange SIM that had "Unlimited
data" on the plan.. only to discover they meant "unlimited, but at
<5kb/sec".

So this time around I thought I should get some local knowledge. Can
you suggest a mobile carrier who has:
 * 3G support for prepaid SIMs
 * Has reasonably priced data plans
 * For bonus points -- will work while roaming in Germany. Although I
suspect I'll just have to buy yet another SIM over there..

Alternatively.. I'd be happy to just get a data-only SIM and use Skype
or similar the whole time.
I hope this isn't too off-topic!

Thanks,
Toby

-- 
Turning and turning in the widening gyre
The falcon cannot hear the falconer
Things fall apart; the center cannot hold
Mere anarchy is loosed upon the world