Hello,
Here is the only Grumman Martlet loss I can find for 28 June, 1942:
Grumman G-36A Martlet I. AX754 (c/n 647).
Delivered 30.7.40
To BPC 22.8.40
805 Sqn ('S') - FTR engine test Western Desert, Cat Z 28.6.42 (S/L JL Willmore killed)*
See:
Fleet Air Arm Aircraft 1939 to 1945
Sturtivant,Ray with Mick Burrows
Tunbridge Wells:Air-Britain (Historians),1995
p.228
*
https://www.cwgc.org/find-war-dead/c...-john-lawrence
H.M.S Grebe =
https://en.wikipedia.org/wiki/HMS_Grebe
Col.