A guy at our unit has a proximity restriction. Having to roster someone to act as his 'standby' effectively means we are down by one controller. No big deal at a large unit, but quite a pooper at a small place.
Don't know where Jerricho got his legal mumbo-jumbo, but we found NATS' interpretation of 'close proximity' rather more liberal. Because our ATC complex is small, our guy is covered if his mentor is in the building . Guess it all depends on the physical size of ATC and the speed with which the covering controller can reach the position. May also depend on the nature of the medical condition, and also on the attitude of unit management.
By the way, I wasn't aware that Gisajob had any mates.