Not just the voltage, but the frequency also: UK is 230V at 50Hz, compared to your 110V at 60Hz.
All your charging units (the thing you plug into the wall) should have a label saying what voltage they run at. Most chargers accept a wide range of voltage/frequency (typically it will say '110V-250V, 50-60Hz' in which case you're golden).
I travel the other way, UK->US, a lot. I usually carry: laptop (aging IBM thinkpad), jb3, ipod mini with wall charger, cellphone + wall charger. Electrically they all work just fine on both sides of the atlantic, of course you need to physically plug them in! I had to buy a second socket converter.
If you're planning on running several chargers together, bring a US mains strip (into which you plug the individual chargers) and just a single US->UK socket converter. (I used to travel with a UK mains strip, until I found I rarely needed to charge more than one device at a time... so I bought a second socket adapter instead, which is smaller and lighter).
Hope this helps!
best regards,
stephen