Going south(up) market street he was about 20 seconds from the high street and war memorial. Barclays, betting shop and others would have cctv. Can't see where he went
Barclays has a camera but that's on the other side/corner of Market Street to the one on which he was approaching and it's trained on the cash machine just next to it.
Looking on google maps street view I can't see a camera outside the betting shop.
I think it's possible he has either crossed over at the memorial and gone down St Nicholas Lane, in a more or less straight line over from Market Street, or he has got into a car just around the corner of Market Street on the High Street. There is a loading bay there which would allow a car to be there without being parked on the double yellow lines. I know it seems unlikely, but he could have been looking for a taxi, or asked a driver for directions somewhere and they've said they will take him. Otherwise I think he would have been picked up on a camera somewhere further down the High Street.