Hi @clarey123 I use Carb and Cals on my phone - as a phone app it works well as you get images of food which help you calculate the carb content - also can be bought as a book.
Definitely recommend Carb & Cals. I use the android app and the book. It's so easy because of the pictures, enables you to make quick estimate if need be, or can quickly do calculation for exact amount. The book is not expensive but well worth it, not sure if I paid for app.
There's also the 'Carbs and cals pocket counter' book, which has fewer pages/photos, but it's pocket sized, so it's very handy for when you're eating out.