I'm not going to name and shame, it's never good.

However, I came across a website today which required me to enter a website address as part of the form, I typed in

www.templedene.co.uk

And pressed the submit button.

The website thought for a minute then proudly told it me had spotted an error, it required that a website should always start with http:// and would I please correct my mistake.

It would be just as easy for them to fix by adding the "http://" to the beginning of the text I'd entered as it was to display the error message, and far more user friendly. Why not take the user friendly route?