My laptop and iPhone are both dual voltage, so in the UK I can get by with just an adapter and do not need a voltage converter.
We were in England a few weeks ago and found an adapter at the local department store for about 6GBP I believe, so you could buy one when you get there if that would be easier.
"At times the world can seem an unfriendly and sinister place, but believe us when we say there is much more good in it than bad. All you have to do is look hard enough, and what might seem to be a series of unfortunate events, may in fact be the first steps of a journey." Violet Baudelaire.