As an update i think what i'm going to do is be taking photograph's of people passing and having my children take their emails so i can post them a view of themselves from the plinth.
I was going to do some embarassing dancing and try and get the crowd to join in, such as the cha cha slide, macarina, etc. I was also thinking of a partial strip to the Full Monty just to embarass my kids, but as it's 10am on a Sunday morning the only people around will be older people, there's not really a crowd.
I have also found out that there's an exhibit in the National Gallery of a live video stream of the plinth. So i will actually be a piece of art exhibited in the National Gallery lol
Paul