No problems with Wiggle, especially since they started accepting PayPal as a payment option.
I prefer to use Edinburgh Bicycle Co-Op - as already stated, great service and communications - well worth supporting.
As an asidem I visited the Manchester (Rusholme)
EBC shop when I was in England test-riding a tandem last July and could not have been happier with the service. I ended up spending about £200 because I felt so guilty about taking up so much of their time!