The following is from a book titled Scandinavian Misadventure – The Campaign in Norway 1940 bu Maurice Harvey………
In April 1940 there were four Hudson squadrons in being, although 224 and 233 Squadrons saw most of the action in Norwegian waters.
A Hudson of 233 Squadron was tasked on 17th April with cooperating with the cruiswer Suffolk in the bombardement of the airfield at Stavanger. The Hudson was to mark the airfield with incendiary bombas and then spot for the gunners.
29th April another Hudson of 233 Squadron calimed the first anti-shipping success of the war when it damaged the merchant vessel Theodor in the Grimstad Fjord.
At the outbreak of war Bomber Command consisted of thirty three operational squadrons, sixteen of light bomebers (ten bBattles and six Blenhiems) and seventeen medium or heavy (six each of wellingtons and Hampdens and five of Whitleys). The Battles were sent to France and took no part in the Norwegian campaign, but all the others performed various roles in the North Sea and over Norway in 1940.
Blenheims were withdrawn from the Norwegian Campaign on 2nd May 1940 becuase of the increasing threat against the low countries
Hope some of this helps!