Personally, if I want to return something, I just do. I dont both quoting rules or laws I just ask nicely if they wouldnt mind giving me a refund and I every time I have done that customer service has always sorted the problem out quickly and free of any extra costs.
It the other way, Ive not received it yet, its been 14 days, so if I return it, Ill be getting them back for pissing me around.