UFO tracked over Europe

We've just tweeted about this.
We have been passed some information from a very good source.
Does anyone know of about an object being picked up on radar over Russia, then Germany and then France, heading to the UK?
A plane was scrambled, got sight of the craft and the pilot was given the order to shoot.
On these words the craft the shot up vertically into the sky.
We would love to hear from anyone who knows more (there are other details we have kept back).
And will this incident feature in the National Archives releasing of UFO info?

The UFO Bureau