not sure if this is a necro post or not, but this thread was toward the top of the board so imma post anyway.
let me just say that i am not in the UK and that im not sure where you can get a "paint" like that. but when I read your post I was reminded of something that I used in a car overhaul not too long ago called a "rubberized undercoat". Its just a spray on rubber that provides a texture that you can then paint over if you want. I think you can get it in multiple colors, but it is usually black. here is a link for an example:
http://www.drillspot.com/products/338398/Dupli-Color_UC101_Rubberized_Undercoating?s=1
I dont know if you can get this in the UK or if this qualifies a "paint" but something like that would give you the texture you are looking for.
let me just say that i am not in the UK and that im not sure where you can get a "paint" like that. but when I read your post I was reminded of something that I used in a car overhaul not too long ago called a "rubberized undercoat". Its just a spray on rubber that provides a texture that you can then paint over if you want. I think you can get it in multiple colors, but it is usually black. here is a link for an example:
http://www.drillspot.com/products/338398/Dupli-Color_UC101_Rubberized_Undercoating?s=1
I dont know if you can get this in the UK or if this qualifies a "paint" but something like that would give you the texture you are looking for.