The EEC recently decided that Paris Orly and CDG were sufficiantly far apart not to count as "competetiive under EEC rules", so if Peel or MAN PLC felt so inclined, they could put in a bid.
MAcquarie - possibly, but they have a lot of investment tied up elsewhere and probaly couldn't afford it.
TBI - no spare cash, wouldn have to borrow heavily against one of their other airports - not permitted by CAA regulations.
Ferovial - No.
The Germans??????