British Pacific Fleet (BPF) shoulder titles?

[DougSA]

I have just acquired this group of patches. They caught my interest because of the "B.P.F." titles, as my grandfather served as a PO Air Fitter with the British Pacific Fleet.

I already have a pair of "B.P.F." titles, but of curved design and slightly different manufacture (photos also attached).

I would be most grateful if anyone can shed some light on the use of these titles, and the variations in design/manufacture.