Thanks for all the info and advice, i went in the way i knew in the end, left Felixstowe around 4.40am, arrived on site at 07.50am, Blackwall, A2, A202 past the Oval and over Vauxhall Bridge, the main problem i had with the job, was finding the right entrance, so big thank you to the bear there. Left off Vauxhall Bridge, past Chelsea Bridge , around 100yds further up is what is basically a turning circle for buses, that was my entrance… had around 5mm to play with either side of my mirrors to get into the place. I had metal decking on for the marquees, tipped out the sides not the roof, was in and out in just over an hour, had to wait for a Dutchman to get tipped first.
I asked the security bloke what the event was and he said the Decorex Exhibition, some furniture and antique do, lasts around 4 days.
Just hope i havent got to go back there and pick the stuff up i delivered when theyre finished. 
Reloaded Romford from there, so a trip on the Woolwich Ferry for that.