Seems from my perspective Google satellite has put the theory to bed for good.
The prosecution must have been wrong for the last 39 years. They are the ones saying he cycled the cycle path from The Sea Wall to Pages Lane. The defence not disputing.
I enlarged Google Maps satellite. The cycle path looks about as wide as a car. Which is no surprise for a gap between fields on farm land.
The terrain will be fine for cycling.
But if your future photos show different, please post them.