it would be very unusual to find a bike helmet that doesn't comply with the rules but we do get people who rock up with skateboard or climbing helmets that do not comply so we won't allow them.
that Orca wetsuit is designed for warmer water than you may find in the UK and as a training suit for pools (the thinner neoprene gives it away). you're also going to get less buoyancy so unless you're a good swimmer, I'd avoid it and you'd be better going with a thicker one (5mm is max).
it sounds like PF in many ways but the key is whether it's painful 1st thing in the morning when you stand up out of bed. if so - that's PF
x-rays usually aren't good enough for a diagnosis, you need an ultrasound scan by someone who understands what PF is all about - a sports medic preferably - followed up by a MRI scan as a definitive so other things like a stress fracture can be ruled out.
if it is PF - good luck with getting it cured as it's a right bugger to sort out.