Hello Geoff,
I think the state of the British Army in 1939 left a lot to be desired: financial hardship between the wars; the arbitrary declaration by successive govts that there would not be a major war for ten years and the large number of officer WW1 veterans stifling recruitment and promotion of younger men all caused problems.
Strangely enough the Anglo-French forces actually outnumbered and outgunned the German Army by a considerable margin (and virtual supremacy at sea in 1939-40) but they did not do more with it. A good summary can be had in Blitzkrieg by Len Deighton (he of spy novel fame).
Cheers
Richard
(Ah, that must be the flag of New Zealand!
)