Hi John,
I know that you have put an enormous amount of time and effort into researching the loss of this Halifax and crew to date and I'm sure that there are people who can and will try to help you more. However, I think you could provide more info about these airmen whose NOK you are searching for in order to save people doing leg work that is unnecessary. Visiting the CWGC website and looking up their details will possibly give the names of their NOK at time of death and sometimes also an indication of where they lived - you should do that and include it in the post.
Searching for NOK is a very long and time consuming effort - I know, I've done it plenty. Asking others to assist is great, but don't expect them to do all the leg work. Most people reading your posts won't bother to go and check on the CWGC to see where the airmen come from, and why would they? On the other hand, if you provided that info in the post it might prove of interest to someone reading who lives near where one of the men hail from or who recognises one of the names of the next of kin.
Good luck and I really do hope you find who you are looking for.
Linzee
