UK traffic law.
It is illegal to cycle on pavement unless explicitly signed as shared use. (these are the blue circular signs with a white cycle and pedestrian)
There are no such signs on this pavement. Nor is there any sign of it having been physically converted for shared use. 

Indeed there is an explicit sign at the  toucan crossing at the western end pointing out that that the cycleway is on the other (south) side of the road. And that has been resurfaced for cycle use and very clearly signed as shared use, with frequent blue signs.
