Hi Linda,
Since you mention you already have quite a bit of info you may already have the details from RAF Bomber Command Losses 1943 by W R Chorley for the night that your fathers Halifax crashed (23/24 August). In case you don't, and for the benefit of others reading the thread, here are the details from the above mentioned publication:
428 Sqdn Halifax V DK267 NA-H on op to Berlin. Took off from Middleton St George 2025. Outbound to target badly shot up by night fighter and partially abandoned. Later, crashed 0200 at Annelöv, Sweden. Sgt Crampton became caught up in the forward escape hatch and could not be freed. He is buried in Halsingborg (Palsjol) Municipal Cemetery.
Crew onboard and their fates:
F/Sgt H A Read RCAF - int
Sgt G W Patterson RCAF - pow
Sgt L S Bates RCAF - pow
F/O J J McQuade RCAF - int
Sgt C E Crampton - +
Sgt J Taylor - pow
Sgt W S Kerr RCAF - pow
Also, in appendix 10 from the same publication is the following information with regard to obtaining files for Internees.
Reports concerning airmen interned in the neutral countries are held at the PRO, Kew, England (now known as The National Archives) in War Office Class 208 (WO208) and within the same sequence of files allocated for the Escape and Evasion reports.
The file reference given for your father is 3319, report (-)1846. There is also one for F/O J J McQuade, same file ref but report no (-)1845.
Further to the information from Chorley, it is also possible that the Swedish National Archives hold additional information so it might be worth contacting them to find out if you have not already done so. Sorry, I don't have contact details for them at present but I'm sure you will find some somewhere on the Internet if you have a hunt.
Regards
Linzee