rights your splashy man had me laughing :D Sounds like you could have been in any pool I've ever been in, there is always one :D
We had to contend with an impromptu swimming training session last week, it was a right pain, I had a woman alternating lengths FC and breaststroke, but to be fair to her, she did always let me past at the wall, there was someone else in there, stood around a LOT then did a couple of reasonable FC lengths.
At one point there were the three of us, her with her breaststroke, him with his slow FC, me with mine and then some bloke got in, zoomed up behind me, tumble turned on the wall and then zoomed down the lane. It was a medium lane, the 2 fasts weren't both overly busy There is ALWAYS one..
I moved into a fast lane where the boyf was and we carried on in peace.
We have now moved over to our Swimming Club pool, as the evenings are usually given over to clubs, nobody knows the sessions are even happening, so the lanes are empty and it's perfection! the pool itself only opened in spring, so everything is brand new and lovely, the water is clean and clear.