The really obvious answer to this (and I'm not defending the corruption, the tory party and their continuous boys-club mentality is sickening) is that when you live in the country, you know enough to know that corruption is happening but isn't everything. Whereas the UK public often only hear about Africa when they're hearing about corruption.

It's also worth noting that whilst there's corruption in the UK, we all really know that it doesn't amount to the full capture of states like Russia.