Until I retired a few years ago I spent 13 years travelling daily between Poole and Portsmouth. I was affected by snow only twice and I don't think it snowed for another three years after that. How can one expect to have the equipment and people trained to use it efficiently when it snows so rarely?
Do you think that the public would be happy to be legally required to use snow tyres every Winter just in case it snowed? This is what happens in Sweden. Why should we expect our airport and local authorities to be any different?