The point is that Mirfield is breaking the law by selling non-compliant equipment. No sure what you mean by "self certify" Ithe item must be compliant before it is put on the market. The only person who can certify compliance (assuming it's not a notified body item) is the maufacturer, the manufacturers agent or the importer.
1. doesn't burn gaseous fuels
2. isn't a cableway designed to carry people
3. is outside the definition for low voltage (which starts at 50V AC and above)
4. is not a construction product
5. it's not to be used in explosive atmospheres.
6. it's not a civil use explosive (those sounds like fun though
)
7. it's not a hot water boiler
8. it's not a lift.
9. it's not a piece of machinery
10. it's outside the scope of measurement instruments for items 1 and 3 in this list
11. it's not a medical device.
12. it's not an active implantable medical device.
13. it's not an in-vitro medical device.
14. it's not a weighing instrument
15. it's not within the scope of a R&TTE declaration because it's closed loop system not designed to radiate.
16. It's not PPE.
17. it's not a pressure vessel.
18. It's not pressure equipment.
19. It's not a recreational craft (if you lashed a couple of hundred of them together it might be)
20. It's not a toy. Well not in that sense of the word.
Ergo under CE at least it's exempt from marking