We moved with two suitcases and a Medium sized Home Depot box last year. Until April that was ALL we had. We brought mostly clothes for winter/fall, two pictures of our cats (they came too but aren't with us yet -some of their stuff took up space in the box), deodorant, Aveda shampoo, and a few books, suits for interviews, some sports equipment/clothing. An X-Box also came along, even after I protested a bunch. Along the way I used charity shops and Primark to get some clothes for last summer, and shopped the sales hard if I had a chance. All of our stuff is still in my parents basement, in boxes, but we sold the bulk of it and frankly i am not sure if we even want to move it at all.
I do miss some of my kitchen stuff, but we've just made do really. TK Maxx for baking things, Habitat sale for plates, a mug here, a knife there. We still only own two mugs, and, until last week, only two glasses. When we moved into our own place we just loaded up at Ikea with exactly the same stuff we had just unloaded in the US, for less than $200. John Lewis has a pretty good cheap duvet and pillow range for bedding and some good quality towels. Primark has cheaper pillows (not sure how picky you are on that) and home things if you need it.
Also, depending on where you are living, you just may not have space for everything if you bring it over. I would take what you need now and then see where you are at.
Eventually you will stop comparing prices in UKP and $, but it definitely takes some time! We also didn't do some serious clothes shopping until we went back to the US for the first time in May after 18 months because the range and prices were so much better. And I still find it extremely hard to find shoes here - between the prices and my size feet (UK 8 or 8.5)!
If you narrowed everything down to the very basics and your kitchen/bedding stuff, how much space would that take? And what would the cost be to take it on the plane and just pay for extra luggage? Is that cheaper than buying again?