How Much Road?

The Highway Code Rule 163 says that drivers, when overtaking cycles, should leave at least as much room as they would when overtaking a car. I assume that the Silver boy with leaxarse lights leaves a couple of inches between him and any car he overtakes...

Later on he seems to need rather more road than anyone else... and overtaking him I return his earlier compliment.

As he was the only driver who seemed to have a problem with my road position and filtering I wonder how big he thinks his rather small car actually is?