Hello John, welcome to the forum.
I also had around 4st to lose following diagnosis. I took the slow and sure approach and eventually reached my target weight (14st) after nearly 2 years.
Not stunning progress, but I was happy to do it that way because, to be frank, I like my food and I preferred not to over-restrict myself.
Anyway, I hope you can make similar or better progress. I can report that I now feel healthier and happier than I have done for decades (I kid you not!).
Andy 🙂