Not too much experience with avocado. We do have five plants (4 years old) grown from seed which I am intending to graft with mango once we have a dome for them to live in. It is too cold in the winter here in France for these plants to survive without a home of some kind.
So yes, in England I would say you need a greenhouse or equivalent for sure. They love the heat.
Good luck!
Thank you Sam for your tip and thoughts.
I going to have another go with it and see how they develop.
Thank you again 🙏❤️