These fuses claim to be BS1362, but cannot be as they are rated 15 Amps. BS1362 fuses have a maximum rating of 13A.
BS1362 is a standard for fuses which are used in BS1363 plugs and some other items. Values are typically 3A, 5A and 13A with other less common values inbetween. There are no real BS1362 fuses above 13A, yet here are some claiming to be 15A.
In this video, these fake fuses are subjected to various overloads to see what happens.