Going to screwfix is even worse now since they took away catalogues and only have the iPads and if you don’t know the correct wording for what you need you can’t find it. Farce
I found the adaptor on Screwfix but it was next day delivery so I went to a plumbing wholesalers and they gave me the run around until I offered the McAlpine code. Turns out they had a few of them at twice the price of Screwfix.
This is where everyone is struggling a bit more now. If you have to order the part from Screwfix you don't get the experienced sales staff to help.