Gianni Sironi has created a catalogue of British commercial overprints! The files at http://www.filateliaspecializzata.it/genoa1.html are in PDF form for easy printing. The image on the left is a sample page (the cover of chapter S).
I've been asked about the Bonney & Lane catalogues that were made years ago. Apparently those catalogues were created in a type of software that cannot be read these days. I'm told that there have been attempts to covert the data, but these were unsuccessful.
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