Accurascale Mk2Bs -- Diagnosing Derailments and Noises

I received my Accurascale Mk2B coaches recently.
I ran into problems with them straight away, with derailments on curves and a constant whining noise.

In this video I diagnose the problems and test a fix for the derailment problem.

00:00 - Model choice and appearance
02:59 - Whining noise from the lighting
04:03 - ABC compatibility
05:19 - Details
06:50 - Couplers and Derailments
07:10 - Roco Couplers
08:45 - Failure to Couple
09:30 - Derailments
12:11 - Testing on a Different Layout
12:50 - Coupler Pocket Position Problem
14:54 - Magnetic Coupling?
15:15 - Fixing the Coupler Pockets
16:18 - Conclusion
17:05 - Where next for Accurascale?