No, but I would imagine it comes under the same social distancing rules as any visits from family and friends - to be avoided as it brings people into contact with people from another household, increasing the risk of spreading the virus.
This Age UK site www.ageuk.org.uk/information-advice/coronavirus/coronavirus-guidance/social-distancing-and-self-isolation/ says -
"Social distancing
This means people who are not 'extremely vulnerable' should only leave the house for limited purposes. These are:
Shopping for basic necessities, for example food and medicine, which must be as infrequent as possible and online delivery used wherever available.
One form of exercise a day, for example a run, walk, or cycle – alone or with members of your household. You should stay local and use open spaces near to your home where possible- do not travel unnecessarily.
Any medical need, including to donate blood, avoid or escape risk of injury or harm, or to provide care or to help a vulnerable person.
Travelling to and from work, but only where this absolutely cannot be done from home.
The Government has made clear that these four reasons are exceptions and you should not otherwise leave your home. This applies to your grandchildren too! They should keep away from you, and you should keep away from them
For these activities you should continue to observe the advice to remain at least 2 metres apart from others (excluding members of your own household) and minimise time outside.
The Government has also closed all non-essential shops and community spaces. Unless you are with members of your household, gatherings of more than two people in parks and public spaces have been banned.
If you are aged 70 or over, pregnant, or have a long-term condition, you are more at risk, so you may want to think about asking someone to pick up medication and food for you where possible, as well as doing any exercise indoors or, if you have one, in your garden and take extra steps to minimise time spent outside the home.