Finally I have a diagnosis for my 16 year old cat.
She has hayfever.
The poor girl had an absolutely miserable spring with running eyes and a very runny nose and was quite distressed.
The vet reminded me I'd brought her in for "eye infections" for the last few years and she'd had antibiotics with no effect. She's had a steroid injection and some steroid eyedrops and she's a new cat!!
I've had 10 cats previously and none of them have had hayfever, I didn't know it was a cat thing.
Has anyone else had this?