Jazzcat,
The HMRC can and do change the rules regularly. My company are currently in negotiations with them regarding our allowances.
In fact, our allowance scheme is having to change from May 2008 and it's been in place 20 odd years.
So, you should be bothered what Ryanair pay in Tax on your pay. Things can change and quickly.
Would O'Leary carry on paying you £24 net per hour if the tax man suddenly ups the amount O'Leary must pay him on your sector pay? I doubt it .....
It is well known that your Sector pay cheques come seperate to your wage slips each month. Its well known that its dodgy.
Be warned, the HMRC are chasing airlines regarding flying pay. Ryanair are no different and are not above UK law.
If I were you, I would think twice about just how secure your pay really is. We have had to, you might too.