In reply to Paul Phillips - UKC and UKH:
> From my understanding of the aforementioned "Trent belly", once you've had it once you're hardened to it and don't get it again.
Oh, how I wish that was the case! Sadly, the Trent trots have scuppered me a couple of times over the years. Generally, though, the more exposure you get to dirty water the less it effects you - despite boating loads over the years I rarely got ill.... with HPP being the exception once in a while!
Mike.