Where can I donate a wheelchair apart from the tip?

What a lovely result AuntieE. I expect that made you smile at a time when you no doubt didn't feel like smiling.

My husband bought a stationary excercise bike a month or so before he died, as he at that point still believed he would get better.

I advertised it, but when no-one was interested I e-mailed the local care home and asked if they could use it, and made it quite clear that I was willing to give them it.

Matron was overwehlmingly grateful and said the psyiotherapists would be too, as they were straining their backs carting the only one the home had from one end of the building to the other.

So I would suggest asking a care facility unless you know someone going to Ukraine any time soon - they can use all the medical equipment we no longer need, of that you can be sure.

Yes,the Red Cross is the place to donate your wheelchair. I have borrowed from them in the past for two relatives. Once in N.
Ireland and once in Dublin. They were a godsend in both cases.
I am sure the Red Cross will be delighted with your offer.

Local Freecycle?
Facebook marketplace (you can say it’s free to collect)

Ooh! That is a very good suggestion there are quite a few a few nearby hopefully one of them will find it useful.

You could try the Red Cross. They hire out wheelchairs, and will accept donations of lightly used ones, in my area anyway.

Have you tried approaching your local nursing/residential care homes? They might be glad of it.