Brian, here is a list that may be useful:
http://www.luftwaffe.no/SIG/Losses/tap422.html
Roberts, thanks for the details of the air battle
The link below will give you some more about the U-Boote side of the battle (sadly almost nothing on the air battle)
http://www.uboat.net/ops/convoys/con...p?convoy=PQ-18
And some reports of the escort (reporting ships sunk and hit, and some aircraft falling)
http://www.halcyon-class.co.uk/arctic/pq18.htm