Is that £1000 for the whole bike or just the groupset?
For £1,000 I don't think you can do better than this: http://www.planetx.co.uk/i/q/CBPXSLPULT6800/planet-x-pro-carbon-shimano-ultegra-6800-road-bike
Ultegra is Shimano's second level groupset.
For a whole bike for a grand, best you are probably going to get is a mix of 105 and Tiagra. And they are both very good.
Edit: just seen @AndyRM 's link... WOW! That will be hard to beat.