I've been thinking about your search - just a question are you sure that any military casualties were not registered locally???
The only similar case that I'm familiar with was that of 30 men of "A" Company 6th KOSB who were killed by a parachute mine which fell on their billet in the village of Theydon Bois near Epping on 18 November 1940. Their deaths were registered at Epping. See the memorial at The Scottish War Memorials Project :: View topic - Theydon Bois, KOSB WW2

I've had a quick look at deaths registered in Newmarket in the December Quarter 1941, on FreeBMD, but those few that I have checked (who were of an appropriate age) were mainly RAF and died on a different date. There was at least one airbase at Newmarket.
Still I'd be surprised if any deaths of military personnel resulting from this raid were not registered with the civil authority.