MSR[HI] - "K" vans and a "C" carriage

A rake of four "K" class vans - these are high-sided cattle transport, some of which were never roofed; the one at the far end seems to be one of them. These are partially obscuring a passenger coach probably from the "Schools Service".
Schools' coach looks like a "C" half of a "Pairs" coach, but which one ? There are over a dozen to chose from ! although, it seems not to have a brake, so that would narrow it down a bit.

Douglas Station, 22nd May 1948.

Webfind, for research
Not my Image : Fair use & research / public information.