This does seem a bit of a non-event but then I recall one of the problems with scrambling jets in 9/11 was the sheer disbelief there was anything amiss... & I'm sure the RAF were glad of a chance to practise!
Be fair, apart from the fact that there was no interception, it wasn't a Heathrow flight, and there was no direct link with the Olympics
I'm not sure that terrorists in control of a cockpit would really worry about the final destination...