Only looked at a few things so far but:

MAN-LHR-AMS is 9000 Avios + £35 so double to original cost.

JFK-HKG (CX F) is 140,000 + £36 (was 105,000 Avios + £50/£60 when I booked recently)

LHR-IAD (WT+ to CW) is £1229! + 40,000 Avios so double the Avios cost.