For the slave-labour comments.
Temu and similar shops work by allowing the Chinese manufacturer or distributor to sell directly to the UK customer, cutting out the import business and local retailor.
E.g. (Purely hypothetical)
Product costs $1 to manufacture
Sells on TEMU for $7.
Same identical product costs $1 to manufacture,
Sells to an importer for $7
Then sells on Amazon for $14
Same identical product costs $1 to manufacture,
Sells to a large retail chain who rebrand it, and put some gloss/packaging around itfor $8
In their shop for $18
etc.
In theory the importer and shop are doing a degree of quality control, and are filtering a lot of the 'crap' that is out there, so you don't see it.
But it is all coming from the same places... Your more expensive item is still likely coming from similar Chinese, Vietnamese factories as the TEMU stuff. Just because it costs more, doesn't mean that poor factory worker gets more money. All of that extra cost is going to the businesses along the chain.
Of course, you can only buy things made in the UK... except they often contain components and parts produced in China. And the UK also has issues with factory slave-like working conditions (see the reports about Leicester and the clothing industry...)