Dan Air (UK) operated 727-100s under G- registry... despite 2 fire bottles for 3 engines.
Never heard that a 727 had more fire bottes as per said CAA standards.
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For the 747s (Classic) both P&W and RR engine airplanes had 2 fire bottles per engine. However for the 747 with GE engines, most have only 2 fire bottles
per wing so for the RH wing, as an example, the 2 fire bottles can be selected to nš 3 or nš 4 engine. I understand that "2 fire bottles per engine" was offered as an option to some 747/GE powered customers.
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Boeing is a champion in "differences and customer options" - need tons of notes to remember them all.
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I admit that CAA requirements go often a step further than FAA airworthiness requirements. But in that case, why did they approve the suppression of doors L-3 and R-3 (overwing) during the early 1980s, on the 747 Classics operated by BA...?
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Happy contrails