She's been odd since yesterday - I went out with her into the sunshine and a seagull started threatening her so I scrambled back inside quickly and grabbed the scabbard (I honestly would have grabbed the sword if it wasn't illegal), seagull didn't attack in that time but I rushed back out to clang it one if it got any nearer to her and it flew off.
Cat has been terrified ever since, and hiding in our flat. She's eaten a bit, had severe diarrhoea, laid out and raised her bottom and tail (submissive pose?) and was rasping a bit.
I really don't know if this could be due to fright? Vets can't fit her in today so it will have to be tomorrow.