I hope this doesn't come under 'advertising', does it? I looked down the page and saw a similar request, and that hadn't been deleted.
If you know other places I could ask, then let me know. I'm around London/Cambridge/Surrey, UK, but I don't see why we can't do it over the internet.
I'm making a short student animation with a therapy session between two unusual characters. I think we get finance to pay actors... I'll know soon.