try this one Gazman, I'm originally from Airdrie and it tastes the exact same as my local kebab shop back there

Half cup of Tomato Ketchup
1/2 teaspoon chili powder
1 teaspoon Mint Sauce
1 teaspoon Vinegar
pinch of Salt
Mix and add water to you get your preferred thickness of sauce.

made this last night, superb.
thanks Bickerton for the recipe

newbie to the forum, from Perth WA. not many good Indian resturants/takeaways here so hoping to pick up a good few recipes.  ;D