ADP - About us - what track record have they got, what other airport's do they own or have an interest in? Can't work that out from their website.
If Coventry is their first (only?) major airport investment I hope they are good at their sums!
Are they employing any third party airport consultancies to advise on all the nitty gritty stuff, like the overwealmingly helpful (!) UK CAA, DfT, UKBA, HMRC, quite apart form all the local, district, county and national politics, planning issues etc. etc.
Good luck guys - could be the knights in shining armour you need!