I think AliExpress is fine for getting things which are the exact same as what you'd get from Amazon/etc. but much cheaper.
However, based on comments in an FB group, that's not precisely the case for copy guitars and the quality and accuracy can be quite variable.
There are some sellers who use pics of real ones in their ads, which is not what you're going to get.
Also (of course) the £250 Chibson is not a £4000 real one, so it's not like-for-like.
Plus, you may find it difficult to sell one on, depending on where you want to offer it.
So, a £250 Chibson is ok for a bit of fun, but it then becomes a £150 plank.
There are people who put money into upgrades, but it might be better just getting something better (Epi, Vintage, etc.) to start with.