So if we take £13k as an example.
Take away minimum days off and leave days. Average the rest on a 37.5 hour week, it comes to 1140.75 hours a year, which we can't do due to EU legislation. That leaves 900 hours as per legislation, which then gives you £14.44 per hour (before tax). Yes, I know not all duty hours are flying hours (SEP, ITF, PST etc), so let's say £12/hour. Bear in mind that this is using just the basic salary, and allowances (however much or little) comes on top of that.
Minimum wage is never calculated after tax, always before. So I think you'll find that you're well above minimum wage. Also, keep in mind the tax break we get...
Not critisising your wage, I'm sure you deserve every penny, but please don't say you earn less than minimum wage.
Going sick means statutory sick pay, ie basic salary.
I'd like to see us get paid holidays, but that's still but a dream, unfortunately.
Gg