I would not get to hung up on the details at this point. I know a few of the people involved, and its a genuine opportunity. They are a small outfit, who are quite possibly deluged with all sorts of questions and queries, which they simply dont have the time to reply to.
I would guess that after an initial period of doing office work, and assisting the pilots and camera people you will start your ATPL written studies, either by distance learning, or classroom based course. Thereafter you would complete your CPL & IR, with training fitted around your working week. Apem have very close links to an FTO, so my personal opinion is that training will be at a steady pace.
From the applicants they will sift through and make a shortlist of 6-10 people to invite for an interview.
If you fit the criteria and are interested, I would simply apply.