Riding my bike on empty pavement when the road is busy UK
It is illegal to ride a bicycle on pavement in UK by the law. It is covered by 1835 Highways Act and Highway Code Rule 64: "You MUST not cycle on a pavement". Penalty is £50.

But it makes common sense and cops generally put a blind eye as long as you are not doing anything dangerous. But at the end of the day it will depend on individual officer opinion.