No wonder this lousy country is facing bankrupcy when a potential customer for an £799 mic is treated like this. So we need some bloody politicans to go for anger managemnt - not me. Or maybe the delivery companies and mic manufacurers, not to mention magazine reviewers.
First - this is a delivery problem. Whoever decided on the delivery company has made a boo boo - but it is the fault of the delivery company for not providing a cost effective solution for the mic sellers.
Second - SE are not made in the UK but distributed by Sonic and for sale in a couple of shops. There ain't much in it for them on a £800 mic so don't expect the earth; they can't very well give you a special delivery costing them £30 when they're only going to net around £60 anyway.
As it happens the particular mic you're looking at isn't a great vocal mic. I would be looking at a lot of other contenders before using it as a vocal mic, no matter reviewers say. Good on acoustics, good as an overhead (note - good, not great) and a good low mid priced mic to have in your collection as long as you already have a decent condenser. Otherwise - leave it till later. It is not a "do many things" mic at all.
Finally - golden rule; the goal! Getting annoyed with prats and shitty delivery doesn't help you in your goals - trying the mic. Think about the goal and not the irritating numpties you may have to deal with. A polite discussion with the seller may get you more money off because you're being arced around - but remember; NOBODY responds to a demand. Moan sympathetically with the seller ABOUT UPS.