Always possible, but still highly improbable. There is no sign of a rising trend in jihadist attacks in the UK - at least not in ‘successful’ attacks, although there has been a rise in the number of conspiracy to commit acts of terrorism convictions - ie. planned attacks which were discovered by te Police/MI5 before they could happen.
I hope you are right. It seems that all of Western Europe have assumed the fetal position with these people.
It’s not just about the cops serving unarmed. That bridge has no barriers in place to mitigate the risk of a vehicle attack.