Alec Waugh had spent some time in Thailand in 50s, getting a knowledge - as he claimed - from circle of royal extended family.
Good reading about King Rama VII and his time in England can be found in book issued few years ago
Siamese Memoirs - The Life & Times of Pimsai Swasti - a lady who had been staying as a child with the extended family in England, later murdered in Bangkok under strange circumstances. Few years ago I placed here few pictures from her book - actually written by her son -
A walk from the 14th October Memorial to Chinatown