A plan approved by the War cabinet to send 1000 Canadian troops from Britain to capture forts at Trondheim was postponed for six days after Chiefs of Staff feared high casualties.
One of Chamberlain's secretaries wrote in his diary that the Norwegians would 'lose heart unless quickly assured of substantial support'.(cited at: Gilbert, M, Second World War).
Two Norwegian submarines were scuttled by their own crews on April 16th 1940 in Verbukta at Tonsberg.
I have included a Movietone newsreel clip from the period, what is obvious in the struggle of the Allies is the Germans' air superiority. No anti aircraft guns or fighter aircraft to defend the British are lacking, little wonder Norway was a failure.