Hi Bob
Found a mention on a PLA notice (no.31)
"25th July 2012
At 10:00 the Tall ships will start departing from Tilbury landing stage in groups of 1 to 3 vessels with the last departing at 11:15 and will start proceeding inwards to Erith Rands. The Tall ships will be joined by 40 yachts from Higham Anchorage and further 60 yachts from upriver. The Tall ships will start to close up and form parade formation with yachts proceeding inwards to Blackwall Reach."
Hope that helps
Regards steve