Now that the great fog of December has lifted for 7 days you are allowed to turn your fog lights off. Infact
94: You MUST NOT
* use any lights in a way which would dazzle or cause discomfort to other road users
* use front or rear fog lights unless visibility is seriously reduced. You MUST switch them off when visibility improves to avoid dazzling other road users.
Law RVLR reg 27