IME washer dryers are a complete pain - doing neither job as well, and gobbling electricity. If you've got room anywear in the flat for a single airer, then I'd say get a decent washer, with a good spin cycle nd go with that.

http://www.whitebox.co.uk were really usefull both for tracking down / comparing machine options [yes - you can filter by colour - I did!] and for the actual purchase - they were quicker and cheaper than my neigbourhood shop by a long way.