> Stress hormones are known to raise blood pressure and cause heart arrhythmia, and it is widely thought that teleworking and the more relaxed approach to working from home have alleviated potential cardiovascular strain of many workers.

The cold is a massive killer.

Heart attack websites talk about reducing sudden exposure and exertion in the cold in their general advice.

One would expect this is from staying in a warm house rather than walking to a car everyday, not general stress.