It the bullet and started today. Dr suggested this app, It's basically Keto / low carb, the app is free and very good. You can also download 3 guides. Lots of recipes. I still feel in a bit of panic that I'm eating the right / wrong thing as this is very very new to me. I have tried every diet known to man but not low carb. It may help some people who are new also, it feels a bit simpler.
https://lowcarbfreshwell.co.uk/