To cross the motorway you could go up to the footbridge with the spiral ramp.
The alternative is use the Cheapside underpass which lies to the left of the photographer's position in yesterday's shot. It has been cleaned up a little bit since my photograph published in August 2007.
At the end is this ramp that leads up towards Morrisons supermarket.
You can this and the ramp at right angles to it on Hyde DP Xtra.