@Inkpaperstars have a look at the link here from the Gov website it is very easy to read.
www.gov.uk/government/publications/coronavirus-outbreak-faqs-what-you-can-and-cant-do/coronavirus-outbreak-faqs-what-you-can-and-cant-do
In summary it says “As with before, you cannot: visit friends and family in their homes”. It doesn’t seem to say anything about gardens but depends on definition of ‘ ‘in their homes’ does this include gardens...?
Over 70s it says this:
“2.1 Does easing restrictions apply to healthy 70 year olds and over?
The advice for those aged 70 and over continues to be that they should take particular care to minimise contact with others outside their household.
If they do go out more frequently, they should be careful to maintain distance from others. They and everyone should continue to comply with any general social distancing restrictions.
We know that those aged 70 and over can be absolutely fit and healthy and it’s not the case that everybody over 70 has a chronic health condition or an underlying disease.
But unfortunately, we also know that as you get older, there is a higher risk of coronavirus having a more serious impact with infection. Complications and deaths are more common in the elderly, even those without pre-existing conditions.
Anyone who has been advised to shield by the NHS or their GP, including those 70 and over, should continue to do this until at least the end of June.”