No need to apologise Adam, I know they're wrong! I've not even seen a photo of a 16tonner with RCH W-Irons.
Back when I built these wagons in July last year, my sole purpose was to do something cheap with the unpainted Dapol RTR bodies. I had a suitable underframe from a damaged Parkside kit and purchased what I thought was another Morton underframe kit.
When the time came to do something with them, I realised my error but, being on paternity leave, with my daughter being two weeks old, and not knowing when I'd get the chance to model again, I decided not to sweat the small stuff!
But you're right, it is wrong, and I'll convert them to a representation of BR W-Irons which is why I haven't painted the underframe yet.
Matt