Backwater Blues - George Melly with Van Morrison

I'm currently reading Digby Fairweather's hugely entertaining account of accompanying George Melly on his last few tours and album sessions and was amazed to read that Van Morrison popped along to lend his vocals to a couple of tracks on George's last album. He didn't ask for a penny though (despite having to travel to the studio and stay overnight in a hotel) and even took out the whole band for a slap up meal afterwards. What a Van-tastic thing to do eh?