Liz, Why would we need to buy BWPi when we have you?!!! Seriously, it is a mine of information, for instance confirmed for me that waxwings eat insects in the summer, and includes videos which I think are more real than paintings. I would be happy to demonstrate on my laptop.
A colleague in work lives near Llangorse lake and would be happy to lead a visit. I wonder if there is much interest in fitting in an extra December trip, whether people would wish to go by cars or minibus, and whether this could be combined with a meal or a few beers on the way back.