Oh dear. You seem to have fallen for it! 
Before dignifying this claim with any semblence of the "the trust" - could you just provide the entry from the leverson enquiry, and a note of where the fund made a payment of £500K?
Given the fund is audited by a very reputable firm, it should be easy to identify that very considerable sum.
Why would the auditors worry?
They will not be interested in much beyond:
Has the company operated in accordance with its Articles of Association?.
Have the accounts been prepared in accordance with the Companies Act 2006?
Do they give a true and fair view of the company’s financial affairs?.
Is the directors’ report consistent with the accounts?.
Has the company kept adequate accounting records?.
Were the auditors provided the with all the information they needed to fulfill their obligations?.
Was the company laundering money?.
If spending £500k was permissible within the above it would go unremarked.