CK wrote:

Please, does anyone know where I can purchase a Selenicerus grandiflorus in the UK???
Cactus/succulent with large white flowers.
Doesn't appear in the current edition of 'Plantfinder'.
Several reference links from www google.co.uk but can't find any suppliers.

It is on Brooksides web page. Failing that try your local BCSS branch plant sales.

http://www.brookside-nursery.com/#ca

or one of the other UK dealers from Cactus mall.

http://www.cactus-mall.com/

Regards,
Martin Brown