hi lizzy
as far as it goes you already have what I could find for him but in the national archives they have questionnaires that were filled out by SOME pows from the camps so you might get lucky that way as they have detail of where a soldier was capture and so forth .
to add to what you have the camp was number 17 .
I don,t know if this may help but worth getting in touch just to see what they have on the pow record on FindMyPast it has infantry record office , the public hall , lune st ,preston , lancs .
do a google search you should find it and hopefully it will have an e mail address .
and lastly have you applied for his service record if not got to
www.veterans-uk.info on there it tells you all you need to know about applying for his record it does take a long time to come through over a year I believe now .
regards
trevor