It's been a strange old year so far, weather-wise. In the last few weeks, we've zig-zagged from snow to rain to blazing sunshine. Either the Weather God's having a laugh, or it's the planet's way of telling humanity we're on our last warning, environment-wise. Your choice.

Anyway, if this year sees a repeat of last summer's heatwave, you won't want to be chained to your office desk. And why should you be? Surely modern technology offers a way to get ...