Unusual train at Gillingham Kent

[DJD200]

Hello all.
My uncle has a friend in Gillingham Kent who says he saw an unusual train in the carriage sidings there, about a couple of weeks ago. He's a retired driver and has never seen one like it.
It was the equivalent of two carriages in length. Top half dark green, lower half red, white roof.
Afraid that's all I have, and no pics. Any idea what it could be?
Thank you

 

[trainmania100]

Guessing barrier wagons for a 466 movement. Can't think what though, I don't know which are red.

 

[DJD200]

That sounded a good call, though pic and vids of the one drag I know of doesn't include barrier wagons.
They wouldn't decide not to use them would they?
Thanks.

 

[leezer3]

Pair of 20s?

File:Totnes 8110 green livery.jpg - Wikimedia Commons

commons.m.wikimedia.org

The red doesn't quite fit, that'd only be the bufferbeams though.
I know the Balfour Beatty ones were about in that neck of the woods, but they aren't green :/

 

[norbitonflyer]

Could it be the NSE-liveried unit, seen in lighting conditions that make the blue look green?

 

[DJD200]

Thanks all, sound feasible, but no repeat sightings so the mystery may remain.