Origamist said:
I was cycling in York on Saturday (Dringhouses to Selby) and came across odd spheres planted in the ground along the route of a cycle path - my friend explained it was part of York's solar system model:
http://www.solar.york.ac.uk/
I thought it was pretty impressive.
If you cycle at an average sort of speed, anything more than 10mph, you travel at a scale speed faster than the speed of light, so you end up younger than you started....

The sun is apparently an old septic tank, and there's a hugely out of scale Cassini probe model by Saturn at Naburn.
Gromit, which cyclepath way? I found myself at the back of the college on one of my jaunts last summer and went down the road by the side of Tesco (off that roundabout), and then the back roads, and it was ok - maybe not at rush hour though... And I wouldn't know how to get to any actual entrance...