There's a bit in Dominic Sandbrook's book, The Great British Dream Factory, about the 'Party at the Palace', and a pic and some short commentary about Brian May. You can read most of it on google books:

https://books.google.co.uk/books?id=IlPBBwAAQBAJ&printsec=frontcover&dq=the+great+british+dream+factory&hl=en&sa=X&ved=0ahUKEwjYrr-E3rHTAhXmDcAKHR7UC9MQ6AEIIjAA#v=onepage&q=brian%20may&f=false