Ok to clarify a few points;
The loan that you can take is with BBVA (large Spanish bank) and is for the full amount (plus a bit extra if you can show it on your business plan) and that is spread over 10 years. The exchange rate is a bit favourable in that the base rate is not the UK base rate but that of Euribor which is about 3.5% at the moment. If you take an 18 month payment holiday, as most people do then it works out to about €1000 or £700/month. Also as you pay for the course during the year for calculation purposes you aren't being charged for the full amount of the loan from day one.
In terms of the flying schedule I'd suggest you look at Henry Bevan's website for that one, he is about 7-8 months in after joining Thomsonfly and you can see from his logbook how many sectors a month he is averaging at the moment.
If you are on the scheme you receive nothing from Thomsonfly in the way of job security, just a letter which states upon satisfactory completion of the course that if a position exists with the company then a place will be offered to you. Due to the always changing nature of the industry that is as good as you can guess. For instance the current good weather here in the UK means TFly aren't having the predicted boom they expected and so the number of new planes to be brought into service next year may or may not stay the same, it all depends as to how predictions go.
However those people on the schemes do tend to be offered places after completion. There is a mentor from TFly who visits regularly during the year and is available to contact via your own Thomsonfly e-mail address and weekly briefs, which means you can at least see how the industry is seen from a management perspective.
There are also moves afoot which may ultimately come to nothing but which if approved would result in TFly offering a similar deal to the Thomas Cook scheme in part, in that TFly would buy some of your debt and then take money out from your salary before tax to pay for it. But that is not in place at the moment nor does it seem likely just yet.
As for qualifications, I guess that's what TFly uses as a means of narrowing down the field of entrants to an initial managable level.