I too lived through the London/City bombs, but just like every other time, we have to adapt by going about our daily lives/UK holidays and being more vigilant.
I have two grown up children working in potential target areas, and the only real concern I have is for the July 7th 'anniversary' - so if ANY day to stay at home/local rather than go into high profile target areas, that is the day to do it. IMO.
If ever a bomb, there is no 'Sophies Choice', if that is any consolation, which I doubt.
We have great security services, which to my mind is why they needed to attack us in soft holiday areas outside the UK - and I'd bear that in mind every day.