Help needed please

Can anyone shed any light on a possible date on this photo please
6016 King Edward V piloted by 3449 Nightingale Rattery

3449 withdrawn 1951, 6018 built 1928
https://railway-photography.smugmug.com/GWRSteam-1/Collett-Locomotives/Collett-460-designs/Collett-King-Class-60006029/60006029-Pre-1968/6016-6019-Built-1928/i-mWN2SBX

thanks in advance

Neil

 

Headlamps changed from red to white over several years starting in December 1936.

 

Can't see any sign of a shed allocation on 3449's framing, which suggests pre-war, but I don't know when shedcodes started to be applied thus.

Leading coach looks to be a C.70 which were built on two lots 1554 & 1559 completed 15/02 1936 & 11/04/1936 respectively. Looking at the state of the carriage's roof it's been in traffic a while as it would have been white when first outshopped.
AIUI the order to paint headlamps white was issued late in 1936 (November?), but took quite a long time to be fully implemented so I'd say Summer 1937 at the earliest... however...

The third coach in the formation is in a single colour livery. It could well be an LMS vehicle on a through working, but it **might** be a GW coach in 'wartime brown'; if so, then maybe as late as Summer 1942?