Thanks Sarah,
I am taking your advice and returning to the vet this afternoon. As now, not only is she not going to the loo, she is barely eating and drinking. It's breaking my heart. I rescued her 5 years ago and after the terrible state she was in, she has been such a bundle of joy. But to see her like this! Well, anyway- not going to dwell. Thanks for your kind message. Amy and Meg x