Hello Richard,
I do have an interest in this area although to be honest it is mainly in the Merchant Navy ships more than the military escorts - surprising maybe as I am ex RN myself.
The Convoy Web site is a great resource and well worth keeping for reference.
Have you seen this site:
Naval Museum of Manitoba - HMCS CHIPPAWA - Winnipeg, Manitoba pictures of all three ships you mentioned in your introduction thread and also a forum to ask specific questions.
I quickly checked the UK National Archives earlier and didn't see much of interest but will have a more indepth search later and let you know.
Corvettes Canada: Convoy Veterans of Wwii Tell Their True Stories. - JOHNSTON, MAC.
Regards
Hugh