Velux is the brand that has become synonymous with roof lights. As you can see from their website www.velux.co.uk, they offer a huge range of different designs and finishes. Usually they are used on the front of your property to complement a mansard or dormer conversions at the rear.
They sit with a low profile, and give the loft a feeling of space and naturally they allow much more sunlight light to the new loft room. There is a vast range of blinds available from Velux, so its easy to finish the job off to your taste.