Thanks @Jadeite, @jeffshoaf. I did some research myself and found this article which helped me remember where I got the method from: https://www.healthycanning.com/why-old-british-method-of-bottling-is-unsafe#The_kicker_doing_your_home_canning_safely_is_actually_less_work
They recommend the American "canning" method too. I will try that. That said, it is all about risk and I suspect the % risk increase between the two methods is not that great if you are careful with either method. You can just be sure you have the 100%(?) safe stamp from the USDA if you go their route.
So thank you for that insight.
In return @jeffshoaf, I will share my storage methods. For fruit that I don't yet want to process, I freeze loosely in vac packs. The pic below is of topped and tailed pink gooseberries ready for making a pie in the depth of winter. They could occupy even less space if I had frozen them loose on a tray and then vacuum packed them completely flat in a bag.
And this is our pouch solution for storing stocks and sauces - a perfect use for a chamber vacuum sealer.