I have great memories from doing this.........like when the rolling stones came on and I had 10 people jumping up and down on the deck of the rib. Lucky it was a Huricane 733, probably would have sunk a smaller rib. Or the time one of the girls lost her grip while taking a pee off the back and falling in.
It's a shame they started charging, you get nothing for free anymore.
One year there were so many ribs and yachts etc you could have walked from one bank of the river to the other! Plus a great atmosphere.