Blimey, you guys fish with some heavy line! I beachcast with 30lb PP (plus tapered Daiwa shockleader), I tope, wreck and most everything else with 30lb PP and I have one reel with 50lb PP for deep water bottom fishing. I have a big game reel with 130lb hollow core braid but I'd be lucky to hook anything in UK waters that would warrant it!
I use a f/s and one small multi in freshwater for lure fishing, both with 30lb PP My PP is rated at the old US imperial diameters/BS, not the newer Metric equivalents.
5Ib is 0.10mm diameter
8Ib is 0.13mm diameter
10Ib is 0.15mm diameter
15Ib is 0