You are correct, Scotland yard would be in a position to vouch for MQM activities in 'England'; It is no surprise then that they have not been able to put a single case, despite many many attempts by many many Pakistanis, to register cases against MQM & AH.
But you may continue to wish it, it is your right. If only such ignorant wishes could come true......
I am sure not only your family but you are on the run too because all of Pakistan wants to kill you and other terrorist sympathisers like you!
Be scared, be very scared of MQM because MQM will not tolerate terrorists and terrorism in Karachi.