Yes, if the device specifies dual voltage operation, you should be fine in that regard.
However, the television broadcast standards are different between the US and the UK, so you probably won't be able to watch any off-air TV programming. And unless the DVD player supports multiple standards (and multiple region codes), you can't play UK DVDs either.
BTW, I highly doubt your unit was US-manufactured. We haven't had a consumer electronics industry here since the late '70s.
[This message has been edited by NJwirenut (edited 02-13-2007).]