I'm just about to book a trip to the Far East, returning in V class in June. Are the new programme's rules likely to affect existing bookings or just bookings made after the date the new rules are announced? As it would mean getting only 2,688 miles as opposed to 12,098, this is of some significance!

I would argue that, once a booking is made, a contract exists that includes the provision of FD miles on the terms in force on the date the contract was made, but I suspect KL will simply ignore any such legal niceties and will be prepared to change the rules to suit themselves.