From this article:

'According to Pakistani officials, there was also evidence of preparations for an attack on Heathrow by British-based activists. There were photographs of terminal buildings and the refuelling centre, as well as of tunnels used by passengers and freight companies. Precise measurements of roads, buildings and underpasses had been recorded. Intelligence sources elsewhere in the region told The Observer last week that the reports had included surveys of underground parking lots so detailed that the gradient of the ramps had been noted. The same sources said the planning also recorded traffic flows on roads around the airport, as well as details of the sequences of traffic lights around the perimeter'.

It has been a constant appeasenik refrain that Britain would never have become an al Qaeda target had Tony Blair not gone poodling up to President Bush and allied Britain to the defence against terror. Yet it appears that this 'old', pre 9/11 reconnaisance activity included targets in Britain. If this is true, it is the first hard evidence that the targeting of Britain was nothing to do with the reaction to 9/11 -- because it was a target before that event took place.

Other evidence has been found to this effect in many places. The terrorists want us dead, and always have.