Agree with Dop
If you only have a small number of slides then one of the flatbeds that has a slide adapter will be fine - results may need a bit of tidying up though.
If you have more, then a dedicated slide scanner is far better and faster, but pricey. The Nikon Coolscan V ED is the dogs bollocks at around 500GBP - the Super Coolscan 5000ED is even better but with it's auto slide feeder add-on don't expect any change from a grand!
You might consider checking around for the many imaging businesses that offer a slide scanning service - it might be worth your while (and a lot less hassle). Here in SA they are ridiculously expensive, but they sound much more reasonable in the UK.
