I think it depends on where you live/work in Britain. Drivers who have to cope with exremes of cold and snow in hilly counties will probably benefit but otherwise ordinary tyres with plenty of tread should cope.
The rubber compounds used in regular tyres stiffens below 7c-meaning there is less grip-winter tyres are made of a different compound which stays more pliant, even in freezing temperatures. In addition, they have a different tread pattern including wider grooves.These factors mean winter tyres accelerate, brake and handle better than regular tyres in cold weather.
However once the warmer weather arrives winter tyres have less grip, wear out more quickly, and cause the car to use more fuel. I used to travel from South Yorks. to Lincoln City centre every day for 3 years and never had problems with ordinary tyres but when I was sent to work in Carluke in Scotland I needed winter tyres.
A compromise is to run all-weather tyres throughout the year, but they have less grip than winter tyres in freezing conditions, as well as less grip than regular tyres at other times.
You pays your money and takes your choice.