With three trips remaining on this project, I’m anxious to hit the road. The weather, however, is playing up – one minute the sun’s out, the next the clouds conspire to steal the light. My destination today – Tinto Hill – involves a day trip, but one I’m almost tempted to invent rather than venture 50 miles south east of the city. Does my physical presence matter, I ask myself, or could I simply make a virtual journey, pieced…

I’m nearing the end of my 33 trips, the magic number I set myself in 2007. In that number, I decided, I would bag as many of Harry Bell’s sites as possible in an attempt to prove that the aligned sites of Glasgow and its environs hold the key to a secret geometry. My trusty OS maps – the Landranger 64 and the Explorer 342 – are a bit frayed at the edges. For the last ten days it…