LadyAlthea - i don't know if these professionals could help, but here is a group of physiotherapists in Malvern who specialise in pelvic issues. I saw them for SPD. It's called Women and men's Physiotherapy.

If you're interested in Botox treatment, you need to see a gynecologist. You may need to google to find a specialist.

This probably is no help to you at all, but I did suffer vaginismus for years (many years ago). I saw psychologists about it with no improvement. In the end, I overcame it with alcohol and lots of lubrication. For me, it was a trust issue.