I would be highly surprised if the consultancy wasn't agreed to be the board.
Whether it was well spent depends on the remit of the consultancy and the reason for the failure in new sources of funding. Eg, the consultancy may have come up with a model that did not reflect the charity's past methods of fundraising and may have presented them with an unrealistic model going forward, considering the capacity of key people involved; or it may have been trying to drag them into a more modern form of fundraising that effectively excluded all the old methods, such as polo. From what I understand, the point of the consultancy was to switch efforts to fundraise to the west coast of the US. Presumably because they were trying to tap into the liberal, socially conscious, Californian crowd Harry was now hanging out with, since the previous fundraising model was to tap into Harry's interests and connections within the UK/RF. That doesn't sound unreasonable on the face of it, not if the charity was to remain "Harry's" charity, and not for someone living their best life ever in California surrounded by A lister friends. As I posited in a previous post, maybe Harry's reality got found out.