[BrianC]

Hi guys

Thanks for the leads, Nick.

Searching through my library, I came across the following in Michael G. Walling's "Forgotten Sacrifice" (Osprey 2012):

PQ4 was attacked by a small group of Ju88s in an area to the south of Jan Mayen Island. Single planes continued to attack the convoy until it reached the White Sea. However, the attacks were not driven home.

The mystery deepens!

Cheers
Brian