Greenford to Old Kent Road 15"11 trailer

Hi, tomorrow night around 8pm ill be going from Greenford to Old Kent road in a 44t 15"11 trailer.
Whats the best route to take, i was looking at a406 down to the a4 and across to the a202 over vauxhall bridge and head towards elephant and castle. But looking at google maps theres a bridge just as you come off vauxhall bridge but i cant see any height markings, obviously being in a 15"11 trailer around london i have to be super super cautious.

Your company should be giving you an approved route for the London Lorry Control Scheme because you will presumabably be coming out again? after the proscribed time period starts.