The Tempest when it will be released - will be the most advanced 6th Gen fighter in the world - and it will only be bettered by what the Americans can come up with.
You have to look at the pedigree of BAE, Rolls Royce to understand the backing it has.
The UK does not assemble many planes in the UK, but it is an aviation heavy weight and when it comes to military technology, we are only second to the USA.
Suggest you use some common sense before start you troll posts on something you obviously have no idea about.