Around 150,000 people have a stroke each year in the UK with about a quarter of these in people of working age, according to the Stroke Association.
Its director of communications, Joe Korner, said:
We are deeply saddened to hear about Andrew Marr's stroke and our thoughts are with him and his family at this hard time.
A stroke happens in an instant but the effects can often last a lifetime.
However with the right care and support it is possible to make a recovery and return to a life after stroke.
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The four-time Olympic champion said on Twitter: "I am not afraid to tell my story anymore."
Social deprivation and suffering from prolonged health problems were the main factors inflating emergency department attendance.
The hills are likely to see the most snow, with blizzard conditions at times too.