The sets were delivered in yellow lined multiple unit ("malachite") green, although initially there were no speed whiskers. Buffers were black on a red buffer beam.

This picture is taken at Duddingston, a station on the Edinburgh suburban circular route. It shows a set in its original livery. George Staddon

Whiskers seemed to be rather scarce (or I've just not got an even spread of photographs?). Also noteworthy in this picture is on the outer side of the buffers the shedcode is painted (21F).

In the early '60s small yellow panels were applied, but with the route indicator box staying green, and they would likely be repainted in loco ("brunswick") green at about this time.

On the 2nd May 1964, this set is sitting at North Berwick waiting to operate the 13:30 to Costorphine. Hamish Stevenson

From the late '60s all over blue appeared, with full yellow ends, although a few had just a small yellow panel for a short time. Another short lived blue livery was painting the cab door yellow as well.

The standard rail blue livery. Also note the early set no. (28) and the 'G' on the blue square. This was a Scottish variant on 'LW'. Stuart Rankin

The early version of blue livery with small yellow panels. The other characteristics of this were red buffer beams, brown underframe, small numerals, and the BR sign on the cab door. Stuart Rankin

The Gloucesters had a very large wrap round to the cab door as it was, without adding to it like this! Stuart Rankin

Although none of the cars were ever refurbished, two DTCs (coupled together) were chosen to model trial liveries for refurbished cars. Applied at Wolverton in 1974, each side of the cars were painted different. The secondman's side and front of 56315 was done in warning panel yellow, with black logo and numbering, and for obvious reasons there was no yellow stripe denoting 1st class. The opposite side was similar to the livery chosen, white sides with a band below window level, although in this case the band was an orange stripe, with a white logo on the band. The numbering was in black below the stripe, and there was a yellow stripe for first class in the usual place. The other vehicle 56317 remained in plain blue on the secondman's side and had a yellow end, but on the drivers side was a plain red colour with white logo and yellow first class stripe. Numbering was either yellow or white.

Views of the two cars at Wolverton on 7 Apr. '74. Keith Gunner. Pictures also appeared in Rail 193 (Feb3-16 1993). 

E56315 didn't return to passenger traffic but in July '74 became part of the Fisons weedkiller trains FA 99900. It's yellow livery was partially kept, the lower side becoming brown, then later red, and finally in ran in green with a white waist band. Another non-passenger set that carried it's own colours was the ER General Manager's "Stourton Saloon" (DB 975664 / 975637) which was painted into Provincial Blue in the mid-'80s.