how come these are being broadcasted in 16:9 ratio?

Im watching these episodes on CSB Action (a UK channel thats only exclusive to Freesat) and for some reason these are in 16:9 ratio and not 4:3 (like tv series were typically filmed in during the 20th century).

How come these are being broadcasted in 16:9 (not that im complaining about it lol) . I mean Kung Fu was made in the early 70s, as opposed to other yesteryear tv series like walker texas ranger, renegade, highlander ect, that were made in the 90s.