They’re not views, there is a right and a wrong here (you’re wrong), but it’s a bit of a point of pedantry. You seem not to listen, but I’ll try it again in as few words as possible.
VAT is due on everything.
Below £135 it’s meant to be collected by the retailer on behalf of HMRC (so nothing is due to the courier).
Above £135 it’ll be collected by the courier, usually the retailer will remove local tax (but they’re obvious not legally obliged to).
So yes, IN GENERAL nothing will be due on transactions below £135 at point of delivery. However this is not “orders under £135 are tax free” as you keep repeating. If HMRC checked a package for a VAT declaration they could entirely justifiably charge you for it. Some retailers will do this - essentially they are complying by declaring to HMRC they won’t collect UK VAT.
To the OP I’d be very confident you’ll have nothing to pay on delivery. However if you are asked for VAT (and the admin fee, which in this instance will be many times more than the VAT) you’ll have to suck it up.