Sad news to report that TheAmbler (who I gather was also known as Penda) died peacefully in his sleep on June 9th. He was 86, and had been dealing with cancer for the last 5 years.
The person behind the pseudonym was the Reverend Keith Ward and he had a passion for crosswords, mathematical problems, poetry, and in his latter days had started to learn Latin. He was doing crosswords right up until his last couple of days and he'll be buried with a copy of The Times crossword, a pen, and Bradfords crossword solver.
Happy solving!
Son of TheAmbler