I suspect we'll never see an acceptable level of FSD in the UK with the current hardware. Our road layouts and traffic are quite complex and it appears that the software is a good way off, even if the hardware could handle it. There are also basic issues such as camera condensation which no amount of processing will overcome.
As a test, I tried basic autopilot to see how it coped with the main road through our local housing estate, bends a few parked cars etc. Zero chance at the moment, it was quite scary quite quickly. I know you aren't supposed to use it in this scenario but I thought I'd give it a go.
It copes on a steady motorway most of the time but even then there are some scary moments.
It will continue to evolve and maybe cope with more scenarios on less complex road systems, but I reckon we're several years away and with different hardware in the UK. Glad I didn't invest in the FSD option to be honest although it would be fun to track the evolution