Haha, I forgot to put my bung in last weekend! Having launched, tied up on the jetty and then gone to park the trailer, I came back to put the engine down and noticed water coming in through the drains in the rear engine well (normally a good couple of inches above the water-line). It suddenly clicked and I ran back to get the trailer! I got the boat on the trailer and then left it to drain the contents of the Solent back into the marina. The amount of water that came in from only about 5 minutes in the water was staggering!
Ah, learning experiences, eh?!
There's weather out there - must be time to RIB!
(Or dive, or ref rugby, or.......)