I would go back again, but its a bit of a trek (a long train ride and then a long walk) from where I am in London... so it would be a bit of a gamble. I might have to give the water plug-in a try then... thanks for the tip.
It's the "flood" plug-in from Flaming pear.com. You only have a 30 day free trial and then have to pay for it, but from what I've tried, it might work for you. I haven't tried it much though. I'd love to see the result if it works!