There is no suggestion that anything about these payments was illegal.
Any chance of the OP asking GN to change the headline? Either "Do you think" or "Could this" at the beginning would do. Learn the lesson from the papers and make it a question then it cannot be seen as the spreading of lies (possible libel as it has now been published).
Statement from Clarance House:
Charitable donations received from Sheikh Hamad bin Jassim were passed immediately to one of the prince's charities who carried out the appropriate governance and have assured us that all the correct processes were followed.
Statement from Sir Ian Cheshire, PWCF chairman:
At a few hours notice from The Sunday Times, we have checked into this event in the past, and confirm that the previous trustees of PWCF discussed the governance and donor relationship, (confirming that the donor was a legitimate and verified counterparty) and our auditors signed off on the donation after a specific enquiry during the audit. There was no failure of governance.
The donation was made in cash and that was the donor's choice.
As it was a rehash of an old story and first went around the right-wing, Conservative supporting media, I imagine this was another deflection from the current news.
Either that or Johnson is actually aiming to be World King and is starting with the UK 
Just to keep everything above board. I will declare an interest as I, too, have given cash to charities in the past.