As expected. Great job following this up.Here's an update for anyone interested:
Trader's address is actually a Chinese "fulfillment Centre" , All items arrive ready bagged from China and a delivery address is stuck on and in the post it goes. It seems that this is a nice way of circumventing checks in this country due to legislative weakness- aka "removing red tape". Trading syandards in Bedfordshire were able to identify the item from the Chinese QR code on the back of the package and they are now in discussions with the supplier. Meanwhile,I opened the plastic box with my thumbnail - ludicrously easy, to see what was inside - see photo. The 4 semi-circular plastic lugs holding the cover can be seen near the box corners.
Mains in was on A and C contacts with live on A - less than 4mm from + contact at one point.
Led strings connected to +, 1 and 3 conns. String common connected to contact 1
Isolation of control ic from mains provided by 2Megohm resistor and ic on the top left.
All in all a nasty piece of work.
View attachment 119342
No robust separation and all in all a fatality waiting to happen.