Thanks for the clarification highwideandugly, with you now!
AKAIK the UK and the Netherlands were one of the first countries to agree an open skies policy back in the 1980s. Over the years, this has been very beneficial to KL for 2 resaons.
(1) Because of the relative sizes of the two countries, there are far more UK regional airports for KL to feed its AMS hub with than there are Dutch regional airports for BA and BD to feed their LHR hubs;
(2) The inability to fly LHR from most regional airports.
Would imagine that KL does very well at UK regional airports and has no need to consolidate.