Hello Marea,
I have just come across your post while looking for something else. The information I have on L4850 is ass follows.
P4580/V, which took off from St Eval at 05:13, was shot down by flak during an attack on the 'Admiral Hipper' at Brest on the 11th March 1941
Crew:
Sgt Charles Maclean Calder Died 11th March 1941 Aged 19
RAF 628106 Son of James Wallace and Hughina Calder, of Carr Bridge, Inverness-shire
RM 40
Sgt Ronald H S Maton Died 11th March 1941 Aged 25
RAF 581235 Son of George and Mary Elizabeth Maton, husband of Phyllis Enid Anne Maton, of Harrow, Middlesex.
(Full name: Ronald Hazeldine Septimus)
RM 48
F/O Douglas Keith Plumb Died 11th March 1941 Aged 22
RAF 41734 Son of Albert Edward O. and Edna Marion Plumb; husband of Jean Plumb
RM 30
The RM refers to the panel number on the Runneymede Memorial.
regards Mike