People spend longer putting on and taking off coats than you would expect.
Leaving Heated house : Put on coat, scarf, gloves = 5 minutes
Into heated car : Take off coat, scarf, gloves = 5 minutes
Walk across carpark : Put on coat, scarf, gloves = 5 minutes
Into heated train : Take off coat, scarf, gloves = 5 minutes
Get off heated train : Put on coat, scarf, gloves = 5 minutes
Walk into heated tube : Take off coat, scarf, gloves = 5 minutes
Walk out of tube : Put on coat, scarf, gloves = 5 minutes
Across the road into a heated office : Take off coat, scarf, gloves = 5 minutes
Shall we pop out for a coffee now we are finally here?
NO, THERE ISN’T ENOUGH TIME LEFT