Who has used AliExpress ?

[Jonathan]

does anyone know if it's best to order

lots at once ? big fees

or lots of little orders ? bigger post fees ?

???

Since you have to assume that the sellers specify the correct value on the customs form, and asking otherwise would be illegal, then unless you can split the order into parts less than the £18 threshold to get charged VAT by HMRC, it's better to order once else you'll pay multiple £10.50 handling charges. Splitting seems unlikely to result in packages worth less than £18 if you're ordering ballscrews, linear bearings and the like.