I believe that the US term is ''parging'', so you may want to post this in Design Dilemmas using both terminologies in your title. And be specific in your location, as products are specific to those locations.

K11agl, thanks for the mellow mocha pic ....yes looks great in your bathroom but I'd hate it on my outside walls lol! The joy of colour swatches eh? I will look up the Crown colour you suggested & some other lighter greys ....maybe even a greige might work? I'd like a modern classic look but don't want it to look too dark or gloomy.

I think from Sandtex the Ivory Stone would probably be my choice. Cornish Cream is very very pure cream, too much so for my tastes. Illustrated White, Sandstone or Mid Stone are less cream but would probably do well with the patio. I think, though, most of the cream and the more yellow stone colours would look great, and you don't need to fret about choosing the right one. Also, it's only paint, and a single story extension is very little trouble to repaint if you later feel you've got it wrong or just want a change. Don't sweat it!

£800,000 in debt after making sure they had taken all the money they could no doubt. The Dyes could easily solve your letterbox and sealed unit issue if they were interested in doing the right thing, as they only place these orders with another company in Lithuania, who are still the same supplier for Hatches. Fyntons/Hatches are basically selling on the contract for significant profit...if they ordered those parts again for you it would cost them next to nothing. Being a Covid issue is absolute nonsense...every other business involved in building and renovation is booming since Covid. And how strange to set up an identical business right in the middle of lockdown! Saw an opportunity to run with the money and start again.