marg444, thanks so much for coming back on this. Have had a look at the site and see they recommend the Balancing Wash for fine hair, but the Angel Wash looks lovely as well. They seem to have some good offers on the site (buy one, get one free), so may try more than one.

I know exactly what you mean about hair kinking in humid weather, but as my hair is short - I'm guessing yours is long/ longish - it's not a major problem so I don't think I could justify the investment in the treatment you describe, which sounds amazing.