Interesting choice!
In the past previous operators have always complained about the lack of revenue, that said back in cityflyers days it was a feed for BA, but they moved i think? a 1000 pax a week at the peak.Unless the fares are really good i don't think to many will use it as a feed for the Gatwick charter market, still it might be a good(or cheaper) way to get to South London.Used Capital a few years back on the 360 for the old CAA exams.Still shan't need to do that **** again(i hope!!!!)
Good luck to them.