It might be more correct to say that a lot of important sites aren't designed correctly and appear to be set to corruptly (both senses) work only with a specific commercial product. Where that happens with public sites the public organisation concerned should be advised that they appear to be acting corruptly.
I leave it to you to decide whether that applies to the Inland Revenue site and whether you can cope with the flak that may fly if you do complain. ;-)
Ikea do something like this, but were out of stock when I last visited MK:
I find most sites that don't work properly in Firefox don't work in IE.
Most correctly written sites that verify with W3c work in Firefox. They often don't work properly with IE.
It wasn't many months ago that the NatWest online banking site could only be accessed with IE. It used to report Firefox as an un-supported Netscape 4.0 or something!
Whereas I would inform the author that their code is incompatible. Then I would shop elsewhere. I do the same with those who use 0870 numbers as their primary contact.
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