Hello Richard,
I'm the Webmaster of
www.raf38group.org
To begin to help you:
Here are the 297 Squadron aircraft serials (all were Albemarles) who participated to Tonga:
Tonga I/II
P1383
V1716
P1400
P1384
V1700
V1812
P1365
V1748
P1367
V1772
V1742
P1471
P1378
Tonga III
V1781
V1778
V1825
P1395
V1771
P1651
P1409
V1769
V1773
V1782
V1776
Concerning 299 Squadron I have a list of all the Stirling assigned to this Squadron who could have flown Tonga but it is a very long work because I've to retrieve what letter what assigned to each aircraft by checking in all the documents. It'll take a few months...
Unfortunately I don't have all the aircraft letters you search but I'll try to help you with what I have (off board).
My email is raf38groupATgmail.com (replace AT with @)
Regards.
Bruno LECAPLAIN