Likely it is supplied in a bubble pack which requires a tool to get into, so as far as regulations go it is safe, or at least as safe as any other electrical item where you can access live parts with a tool.
It's not even a great deal, CPC sell non-salvaged 13A plugs for 83p each including VAT in one off and a bit less in higher volume (admittedly if it's the only thing you order you will pay shipping on top of that but seboshop also charge for shipping)
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local