I haven't gotten taxed for anything I've ordered from them. I keep it below $50, shipping included.
On deliveries, I'd say half my Amazon UK purchases arrive at my home, the other half I pick up at the post office.
HOWEVER, I've been having great difficulty with Amazon UK deliveries ever since the Cubao post office burned down. I used to receive my packages from them about one week after shipping. Now it's usually a week AFTER estimated delivery date. Plus, out of my last 4 orders, 2 have needed replacing. One arrived TWO MONTHS after estimated delivery date (and I had received the replacement already). The other was replaced a month ago, and neither the original nor the replacement have arrived.
