Also I seem to remember a Britannia 737(?) seen regularly at Newcastle with reg G-BYAI (whyaye). Always wondered if that was deliberate!
This was a B757-204; "whyaye" was not deliberate, but the crews did appreciate the joke. That purchase went from G-BYAC to G-BYAY, all new build except G-BYAM which was on lease from Monarch and built to a different standard.