well i think there are a few scenarios as to what would happen.
1. If a tornado outbreak of that magnitude was to occur in the UK again i think it would be shear chaos across the country as most people in this country don't have a real understanding of how dangerous tornadoes are unless they have watched programs like Storm Chasers or have the knowledge of weather like most of us here on the forum. So the phone networks would be jammed with calls, the emergency services would be maxed out, and roads would come to a stand still. So in this scenario i think many of us wouldn't even be able to get online, let alone have power supply to do it. (Id be out tracking the storms).
2. The UK government is prepared for such an event (HIGHLY unlikely) and would have back up power resources and communications so the UK could continue as normal and the Forum would go nuts (though id be out chasing) .
and finally 3. It happens in like 10 years time when the communications networks are much more advanced, the Met Office have much more advanced systems and American style Doppler radars across the UK, and the British public are much more informed to the hazards of tornadoes. In this case there wouldn't be much of a problem and we would all be in the Forum chatting away or out chasing. That's my take on it.
DITTO! and may i add probably doing about 120mph down the M1 haha