Police spotting (junction watch)

It's not grey at all.

Until you get on your bike, you are a pedestrian*.

As a pedestrian, it is impossible for you to commit any line / signal offences that relate to vehicles (including those that apply to bicycles).

Other offences that might apply could be obstructing traffic, I guess.

• You may, however, be charge with drunk and in charge of a bicycle, even if you are not riding it. Perhaps you should lay off the booze first thing in the morning...