This is brilliantly written and very, very funny.
Hard to pick a favourite letter, but I particularly love the chapters titled 'The Beat Musicians' and 'Leaders of Britain (For A Short While)'. The letters to Thatcher and Cameron are priceless, as is the 'who are you and just why are you famous?' letter to Michael McIntyre in the 'Hoofers...' chapter. Not to mention the Julian Clary letter... Like, I say, hard to choose a favourite - every one a winner, frankly!
Read it with HRH's voice in your head for maximum effect. All of my loved ones (who are deemed worthy of it) will be getting this for Christmas, and so should all of yours.