Year 0 is approx 22K not including sector pay which can mean 200 extra in the busy months so perfectly survivable, rent in Newquay is quite expensive but if your single its easy. (For context I have a family and we've done ok)
The 7 positions are based on Sunday flying being accepted by unions and staff which is nowhere near being finalised so expect probably 5 initially to cover the departures and probably a few stragglers mid next year. Start dates are usually January but apparently they are aiming to get a few earlier this year to ease the training load.
Magic - If it was the call I would imagine they would have left a message or will at least call again if you have been shortlisted, I haven't hear of any scheduled interviews yet
Cornish connections desired but not essentials, I'm Irish… but I got in with a mixture of faith and good fortune and it wasn't as competitive as it is now