@LochJessMonster how are you interpreting the government guidance:
"if walking your dog in areas used by other people, you should walk your dog on a lead to ensure you can safely keep 2 metres away from others."
As:
"That can be interpreted as ‘keep your dog on a lead if you can’t keep it 2m away from people’ some will argue they have adequate voice recall to keep their dog 2m away. "
Unless you are walking your dog on private property which only you have access to, then you will be in an "area used by other people" so dogs should be on a leads. Simple, straightforward and clear. You have to try pretty hard to interpret that to mean that voice recall is acceptable.