[user104658]

£0 to sit at my lovely desk at home . We do drive quite a bit though (my wife for work, supermarket trips, random jaunts to the hills/beaches etc) so we probably spend about £60 a week on fuel on an average week. Less if my wife's on leave, more if we randomly decide on a "big drive" (we've been known to go on random 5 hour drives on a weekend).

So yeah we spend about £3000/year on fuel . I guess it would have been slightly more when I didn't work from home, but not that much, it was only about 10 minutes drive.