Thanks for all your suggestions on how to dispose of Lester. In the end we decided to be very matter-of-fact with Anna. We told her that Lester had had good life, but that unfortunately he'd died overnight and that we were going to flush him down the loo to the ocean (thankyou finding Nemo!).
We made a solemn grouping around the toilet, Lester hanging limply in a fishing net. LK spoke about how pretty he was, how he was always eager to zoom up and grab a pellet. Meanwhile I'm thinking, *damn* the only two things I could say about the bloody fish and you've already mentioned them. I gave a suitably sombre pause and waxed lyrical about how he'd always been a good friend to Anna and that we'd been lucky to have him as a member of our family. Anna was last. More than anything she wanted to flush him down, but we suggested she say something nice by way of a goodbye. She said 'I want you to come back from the ocean alive so that I can play with you'.
Then it way bye-bye Lester, two of his mourners praying vehemently that he wasn't going to break up in the watery vortex.
In relaying the story to my Mum and Dad later that day, my Dad said 'she'll be looking for him whenever you go to the beach you know'. If only that were true! He was right in that she is looking for him, newly reincarnated from his trip to the ocean, but at his point of departure. She is fully expecting him to reappear in the toilet, ready to play. Honestly, best laid plans etc etc. We are going to have one seriously constipated 3 year old on our hands at this rate.