https://www.gov.uk/government/public...an-and-cant-do
1.7 Are there restrictions on how far I can travel for my exercise or outdoor activity?
No. You can travel to outdoor open space irrespective of distance. You shouldn’t travel with someone from outside your household unless you can socially distance.
So no pillions, and always stay 2 metres apart.
Unfortunately, those in Wales aren't so lucky; the Welsh police will also fine drivers and riders who have driven into Wales from England unless the journey can be proved to be essential.