I got AirlinePrep to do my CV / Cover Letter for the airline I now have employment with (they are Irish, but not RYA) - I also did an afternoon of interview practise. Both worth every penny and interview practise was second to none. Before I got offered this job, I had an interview at an Exeter based turboprop flying company - I got commended for how well my interview went.
The interview practise wasn't just how to answer questions, but also articulation, approach and how not to get flustered!