Whilst the 45k may look good from the outside - don't forget as previously mentioned the COST involved (not to mention the risk of actually paying for training!)
Courses are im guessing around 75k at the moment, plus you need living costs etc for up to two years. It costs in the region of 100k, plus or minus a bit.
Ok, so you earn 45k, you should be able to pay off the debt.... Don't forget that 100k is AFTER tax. So for you to pay off 100,000 worth of debt you would need to earn roughly 200,000 (income tax and NI taken from it would leave you just over 100,000). All of that is FORGETTING the interest involved - it actually costs a lot more!
Putting aside £200,000 gross to pay off your debt is not easy - and thats if you even get a job at the end of training! Many people take the plunge and end up having to give it up as they can't get jobs - so if some pilots get paid well then fair play, if they didnt get paid well what on earth would be the point in taking such a huge risk!