SO if the money is in a UK bank it can be substantiated easily. It will be released after probate has been completed and provided the people involved have can show the bank executors information.
So all they need to do is send you the correct information which you can validate with the bank independently. Regardless of the "friends" location the death of a person in the UK would lead to this paperwork trail.
What makes me laugh is that in that position the bank would be bending over backwards to "assist" the person through a high interest short term bridging loan to allow them to "release" the money.
So we see one simple process.
1. Meet
2. Become friendly
3. Work slowly to build trust
4. Test trust
5. Go for broke
As Mr Tony said, the IPR of this scam was Nigerian based for many years. I am just surprised that Chinese people are trying it on, I had a higher opinion of them than that. Maybe they have miniturised it and put it into mass production and I missed something
There are some fantastic "reverse" scams that have been played on these programs. You tell them you are happy to do this but they must join your "religion" as that level of faith needs to be established prior to you commiting to assist them. You then ask for pictures of them doing odd things (weird places at strange times of day, odd clothing, posting odd items like fingernails) in return for your trust and just string them out. I got one of them to 11 events before they went nuts at me.
They don't like it 'up'em Mr Mannering.
Run quickly.