Well thanks to all who gave me some great tips on the varnishing of the carriages. These are actually starting to near completion. The two closest to being finished are all 3rd no. 6 and brake 3rd no. 9. These are fully kitted up with lights, and are now just awaiting some paint touching up, glazing, foot/running boards, and lamp brackets at each end. Here are some pictures:
Both carriages:
All 3rd no 6:
Brake 3rd no 9:
The other two vehicles are all 3rd no 7, and all 1st no 8. These now have roofs, but await lighting being fitted, door and grab handles, buffers, vac pipes, etc. Here they are in their current state:
All carriages have removable roofs, allowing me to finish the interiors as and when I please, as I'm notoriously slow at painting figures. The roofs are scratch built, using methods suggested by MDLR and others on this forum, no 6 representing my first go. All will be fitted with lighting, using some 10mm (I think off the top of my head) LEDS with two AA batteries wired in below the carriage. There is no switch, you just plug the connector in to switch them on, and the charger will plug into the same spot as well. Here's a picture of the brake 3rd lighting to give you a idea of what I have done:
The aim is to get the exteriors finished as soon as possible so I can run them during the summer and withdraw my bogie carriages as these need some major overhauling fairly sharpishly!