Mercenary Pilot is only ½ right about the CPL, only 5hrs has to be completed in a complex type, excluding the skill test, so in theory you can use it for 20hrs of your CPL (if you do the CPL before IR).
Also as far as the C of A is concerned, I am sure (please quote me if I'm wrong) that an aircraft being issued a new C of A now has an EASA C of A instead of a Private or Public C of A, this meaning that you can undertake flight training on your own aircraft by a suitably qualified instructor (not the case had it had a private C of A)
jxc be careful buying one in the view to selling it on, this could prove difficult with the impending economic downturn (unless you can afford to keep it of course)
D777