I was watching Deadlier Than The Male today and it struck me that this very well could have been a Saint movie in the 1960's with Roger Moore. It was filmed at Pinewood studios during the same time period, and has that distinct feel. It also features a Volvo 1800 hiding in the background of two different scenes.
Bulldog Drummond was written by Sapper around the same time that Charteris started up The Saint. He is very much in the same genre, and is part of my suggested reading list for fans of The Saint.
Amazon USA and Amazon UK both carry extensive collections of Bulldog Drummond books, tapes, posters, and DVDs.