I wonder sometimes, as I swim around keeping my face out of the water.

No.
As a child I was always informed that there was magic 'dye' in the water that would turn bright blue and could be seen leading back to you if you did. And to this day somewhere in the back of my mind that idea has never left me.
C'mon fess up offenders is it true?

I doubt it. I do seem to recall it being part of a comedy sketch. Might have been Harry Enfield but could have just as easily been Mr Bean. Can't quite recall.

Nah, I was a child living under this threat long before those two started up.
Maybe they were threatened with it too though?

Urban legend - I was always told this too, lol.

http://www.snopes.com/science/poolpiss.asp

Yes. But never from the diving board.

or from the viewing gallery..ideally one should be in the pool at the time

That could hurt.

I'll get me coat.....

I think it was the fast show

Peeing in the pool is like doing a good job at work; it gives one a strange warm sensation but no-one seems to take notice.

I remember from somewhere a quote along the lines of "The definition of a Gentleman is one who interrupts his bathing at the seaside to go to the latrine"

Quite....but I also think that the definition of a gentle person is that they eat properly, and put a knife, fork etc down and don't eat like an animal given the chance...I will die before devouring like someone I don't want to be.

Your use of the term "gentle person" reminds me that I can't recall a similar definition of "gentlewoman".

I always wanted to dive into the pool and glide across the bottom as I was peeing, and pretend I was in the Red Arrows...


... but I was always too scared that the dye really was there.