This is how:

Organize an event to get 250,000 people (including many from all around the world) to have a march all the way to the embassy and DEMAND his immediate release OR ELSE redirect these people to go to the British Parliament and CAMP THERE until it is DONE!

Only through MASS PROTEST would the corrupt British Gov't stand down. (they don't have the numbers against the masses if enough people join).

If we citizens of the world cannot get a measly 250,000 people for this, then we don't deserve to be free ourselves!

A person like you , Mrs. McKinney, with your status and contacts could enable/mobilize this; little 'ol me - not so much.