Could someone tell me the best thing to have from the Indian takeaway please.. I'm thinking Chicken Tikka?

Hey Sue! Maybe Palek Paneer? (Cheese and spinach.

No butter chicken, it will have too much cream which has 1g per tbsp.  Go with tandoori if you have to have Indian.  It's a dry rub more or less without sugar, ask the restaurant to make sure.  Tikka just means pieces of chicken.  The tomato based sauces are full of carbs.  It's a land mine don't do it is my advice.

Tandoori chicken or fish, you could do Seekh kebab. Malai chicken boti is a good one if the menu has it.