Other than the vlotage which is a quite large issue!
TV's in America use a totally different standard then we do over here, you use NTSC we use PAL and they are totally non-compatible, your blu-ray DVD player would output NTSC so you could use it with your TV but not with any other TV in the UK,
Dell PC check the back to see if there is a little voltage switch by where you plug the power in, if there is yes without a transformer if no new power supply is cheap. laptop yes just needs the plug changed will work no problem.
Other bits (hair dryers fans, toasters, coffee pots microwaves) it would cost you more to ship them over here then it would cost you to replace them over here so probably not worth it.
I take it your moving over here soon then :) good luck, we are not too bad :)
and if you need anymore advice happy to help, My friend done it the other way a few years back