The distance is irrelevant.
Everyone is allowed to deliver food and medicines to relatives who are vulnerable and in complete lockdown. There is no distance limit.
Official Government info leaflet :
"People who are 70 and over, or those who have an
underlying health condition, are likely to be more seriously
affected. It is even more important that you protect yourself
now by following the advice above.
If you are at very high risk due to a serious...