That map with the route on in the article I think is incorrect. Unless they have got the route info from the police.
The CCTV still image has been pinpointed to the intersection of Charlotte St, St Andrews St and Crooked Lane which is half a mile further North than where Guild St and Market St meet.
Unless, for some reason that was from another time/earlier in the evening and that's what has been issued in the reporting rather than the actual CCTV still from Market Street.
I'm not sure why they would issue a still from CCTV if it wasn't from the last or one of the last sightings of them so people might recognise them by clothing etc.
If the CCTV shot issued was from the same journey of them leaving their house their directions are more erratic.
I've super imposed the route from the Sun article in red and the green circle to the north is where the CCTV image is from.