SS,
I think the use of mint is a regional thing. I've seen in included and not included, depending on which resturant you are in. Same goes for Patia really - lemon or jif or dressing, etc.
I'd recommend making it exactly like the recipe as you can always add a tiny amount in later on if you don't like the result?

Martin
I've made this once and it definitely tasted 'Scottish' if you understand me. As BB1 wants to let us know how it tastes in his TA, I'm following to the letter; that way I can work out if it is to my taste as so many curries are eaten and we only presume what goes into them. The base for example: If I hadn't seen the ingredients I'd sworn there was carrot in there somewhere, based on the texture of the result.