My own experience of buying into a non-EU country from any other (EU or non) is that "it just depends". On what I don't know. Sometimes I pay (Swiss VAT and import tax) sometimes not. And to me anyway it does not seem to have any rhyme or reason - as said sometimes I have to pay, sometimes not. It does not seem to depend on the value, or on the type of goods either.
But there is one thing that really does offend me - the courier company's "handling charges" or "admin charges" or whatever they decide to call it. The likes of DHL, FedEx, TNT, UPS, etc, etc, all seem to add a charge which IMO anyway, is ridiculously high, and again seems to bear little or no relationship to either the value or the type of goods.
However, to look on the bright side for once (not that it helps you in UK)! I use Pegas blades for my scroll saw. They are made here in Switzerland. I buy them cheaper in Germany that I can from the official Pegas dealer here in Switzerland. Likewise, when I bought my Record air filter for the shop, it was cheaper from Germany (WITH Swiss VAT, customs duty, and shipping from there) than it was from the official Record dealer in Switzerland, about an hour's drive down the road from me.
Go figure.