DO NOT USE THESE PLUGS!
At PAT Flow portable appliance testing we are coming across more and more of these counterfeit plugs in domestic settings. They generally come from online retailers and are shipped for China most usually (but not exclusively) with IT equipment.
These plugs are not fit for use and should be removed.
They are not fused to protect against overload and have insulation on the Earth pin meaning that any class 1 appliances that need earthing as a means of protection from electric shock could become dangerous.
I recommend checking any electrical items purchased from online marketplaces that may originate from outside the UK.
If in doubt look for the kitemark.