Brian
From the relevant page on
www.luftwaffedata.co.uk -
"
18 May 1940 – Two 1(F)./122 Heinkels on a sortie over Malangen encountered a Walrus launched from HMS Devonshire and shot it down."
Shores' "Fledgling Eagles" has a bit more (you have most likely found this already) - P5647 crashed into the fjord and Lt.R W Benson-Dare and one other killed.
One of the He111s also attacked a Norwegian streamer "Sirius" in Solberfjord.
The recce he 111s also called down a force of He 111s of II./KG 26 to attack british warships - the battleship Resolution was damaged and withdrew to Scapa Flow.
All above from p324 of FE.
Unfortunately, nothing else on the tww He 111s........