Finnish-marked British planes?

[Dick Powers]

I an reading “Rising ’44 The Battle for Warsaw” by Norman Davies. All reviews I have seen say it is the best coverage of the Warsaw uprising.

I the second chapter, the author provides an overview of the Allied Coalition and how Poland fit in to the coalition.

When talking about the Russo-Finnish war, Davies claims that ...
“They [British and French] were considering an assault on Norway, which would have given them the dual benefit of access to Finland and control of Sweden’s valuable ore exports. British planes painted with Finnish markings were already standing by on airfields near London when the Finns decided to cut their losses on 12 March 1940 and make peace.”

He doesn’t specify what the ‘planes’ were supposed to do. Chapter notes don’t provide his source for the statement. British planes outside London in Finnish markings ( a swastika) in March 1940? This sounds suspicious to me. Am I missing something or does this sound like something from The History Channel? Can anyone here shed light on this supposed expedition and just what the planes were supposed to do?