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@Spazturtle wrote:

If the court summons me to stand as a witness what happens if I decide I don't want to turn up?

The government need to actually enforce the law on businessmen who seam to think it doesn't apply to them, they should freeze all of Facebook accounts and operations in the UK until he shows his face.

Maybe read and understand the article first, which stated:

or the threat of a formal summons

So, leaving aside the question of whether they have the legal authority to issue a summons to someone who is neither a citizen nor in the legal territory of the country, they haven't issued a summons yet.

Since no summons has been issued, he is under no legal obligation to show up. And if such a summons is issued, it's pretty much settled law that a non-citizen who isn't in the countries territorial jurisdiction is not obligated to follow the laws of that country.