'Elf 'n' Safety front ends

This from the Commander...

In regard to the view of the glossy pic adorning RailTalk in this month’s edition of Captain Deltic’s flagship publication showing LUL’s new ‘S’ stock’ red front end, is there a difference I’ve missed in the requirements for National Rail and LUL?

One notices the Overground ELL units with their yellow front ends, and one remembers the SNCF having to adorn their beautiful casse-nez BB 22000s with yellow protuberances in case they ventured into the daylight at Folkestone.

Again, on mixed LUL/NR infrastructure areas, according to LUL Track Awareness, on receiving a warning from a train driver staff should move to a place of safety and then acknowledge, where as the NR PTS requires an acknowledgement before moving to a place of safety, or you’ll fail the exam.

Likewise, do Chiltern units sound the distinctive LUL warning notes on their horns according to their direction of travel where the lines merge north of Harrow?

Sorry to sound a discordant note - perhaps I would be better employed celebrating today's 205th Anniversary of the Battle of Trafalgar!

UPDATE: The Fact Compiler observes...

The absence of a yellow front end on the ICE3 set at St Pancras received much comment on Tuesday.

As most modern trains now have front end lamps than can be seen from deep-space is it perhaps time to review this particular Standard?