For the British is a connection!

What is it?
It is this:

http://www.xinhuanet.com/english/2018-05/29/c_137215321.htm

The prince cannot negotiate the terms of a trade treaty that has real meat to it. 

So, maybe this is a goodwill mission that he will be well compensated for doing.

C'est la vie.

He has to make a living somehow.

However, you will notice the benign smile of Xi. As for the Prince's look? There is just the passing shadow of anticipatory tension and anxiety.