Hi
Apologies for bumping/replying to an older post- am only just catching up. Have been doing a bit of research about these locos in connection with a small writing project I have in progress so have been looking a lot at them. I would, respectfully like to dispute/correct your comment above re the grey livery. Firstly some background, Benest reveals that initially it was suggested at the Chairman's Conference that the wartime livery should be matt black and instructions were issued to Acton Works to paint the locos thus. However this did not happen (I shall have a further nose around the archives at Acton to see if I can establish a reason) as when the Chairman went to inspect the subsequent repainted loco- No 20- on October 5th 1942 it was discovered to be in Service Grey. Benest reports that the application of the livery to this loco and subsequent grey locos differed mainly in the description of the numbers and letters. The Chairman seemed to approve however and gave his formal approval for the grey livery to be applied instead. Most locos received the grey with nos 3 and 5 being unknown. Additionally No 17 was withdrawn on October 10th 1943 without receiving grey.
As the need to retain the locos post war became apparent it was decided to retain both the names and the pre-war Maroon livery. Both generally coincided with the overhaul programme but there was a desire to get the names back on as quickly as possible. This meant that four locos were still in grey when they received their new plates- the first being No 8 on October 5th 1953 in addition to Nos 6, 11 and 12. These received lined maroon in January 1956, May 1956 and December 1955 respectively. No 9 was by now a service loco (as March 23rd 1950) and was not reunited with the 'John Milton' name.
Post war restoration to Maroon started with No 16 (incidentally one of the last two grey repaints too) in December 1953. This featured front numbers only and had LT bullesyes in the previous number position on the bodysides. London Transport lettering was also not carried. The next four to emerge- No18 in late 1953/early 1954, No 14 in June 1954, No 10 in August 1954 and No 1 in November 1954 - differed from No16 in that the number was restored in place of the bullesyes- and all four still omitted the London Transport fleetname. A further change came with No 4 in January 1955 when it appeared with a bullesye motif on a plate at the end above the destination board. No 2 in March 1955 was similarly adorned. Both still omitted the bodyside London Transport lettering. The next loco repainted- No 3 in July 1955- received what became the 'standard' post war LTE lined maroon- with the fleetname restored to it's usual previous position, although not mounted on a board as in the grey livery. All remaining locos received this version with the earlier versions receiving it at a subsequent date.
One further 'oddity' was No 9 which on repainting from grey in September 1957 received unlined Maroon with 3 numbering. No 9 was used by this time as a service loco which worked the quarterly stores train on the District from Ealing Common- where it was the depot shunter- to Little Ilford Sidings at East Ham. Not all locos received the LTE maroon- No 17 withdrawn on October 10th 1943, No 19 withdrawn March 12th 1948, No 15 withdrawn on September 18th 1951 and No 20 withdrawn on April 26th 1954.
Hopefully the above makes sense and is of some use/interest. As others have mentioned it is well worth getting a copy of Ken Benest's "Metropolitan Electric Locomotives" 2nd edition to get a comprehensive history of these fine (and their predecessors) locos.