He only offered after starting court proceedings it’s worth noting.
But as has been made plan, Met Armed security isn’t available for hire - by anyone, ever.
If you are assessed by RAVEC as needing security, you will get it. For free.
All H has to do is give 2 weeks notice.
He could also make it easier by staying in one of many royal residences where security is already in place. But he wants to stay in hotels of his choosing costing the taxpayers yet more money.
So let’s be clear he is not (and never has) been denied appropriate security in the UK.
What he wants is 24 he armed security as and when he deigns to visit with no notice.