I live near London central (20 mins from Oxford circus), the best internet I can get is 18 Megabit, and this is in a relatively modern building (< 15 years old)

I live near London central (20 mins from Oxford circus), the best internet I can get is 18 Megabit, and this is in a relatively modern building (< 15 years old). My situation is not uncommon here in the UK, Internet infrastructure here is terrible. Google Stadia is a non-starter for me.