Alex Smart has compiled a list of Coastal Command losses for July 1944 over on RAF Commands Forum, linked below:
http://www.rafcommands.com/forum/sho...mand-July-1944
I'm not sure how comprehensive the list is, but 172 Sqn lost a number of Wellingtons while 547 Sqn did not, in July 44. (According to the list, but again, I'm uncertain if it covers all Coastal Comm losses; or just the ones Alex is questioning.) Alex is also here in this forum, so perhaps can shed more light in due course.
...geoff