How do you police this suggestion?

Don't like the wording of the idea as it stands. The police are having to control the current restrictions - which appear to be being flouted quite a lot.

What I would like to see is the ability of grandparents to reconnect with their grandchildren and take up their pre lockdown childminding roles within a single family unit.

Where parents are working from home - through choice or necessity - AND having to home school young children it puts extra pressure on the family unit. If grandparents were allowed to step back into the breach and share some of the childminding, parents would be more productive in their work, and the children would have a diversion from the daily routine.

The downside (in our case and many others I guess) is that this would necessarily involve additional car journeys.

It would be relatively straightforward for police to determine a grandparent/grandchild link when trying to maintain the lockdown guidelines.