Found it
www.legislation.gov.uk/uksi/2020/350/made
This is March 2020
6.—(1) During the emergency period, no person may leave the place where they are living without reasonable excuse
(f)to travel for the purposes of work or to provide voluntary or charitable services, where it is not reasonably possible for that person to work, or to provide those services, from the place where they are living
Restrictions on gatherings
- During the emergency period, no person may participate in a gathering in a public place of more than two people except—
(a)where all the persons in the gathering are members of the same household,
(b)where the gathering is essential for work purposes,
(c)to attend a funeral,
(d)where reasonably necessary—
(i)to facilitate a house move,
(ii)to provide care or assistance to a vulnerable person, including relevant personal care within the meaning of paragraph 7(3B) of Schedule 4 to the Safeguarding of Vulnerable Groups Act 2006,
(iii)to provide emergency assistance, or
(iv)to participate in legal proceedings or fulfil a legal obligation.
essential for work purposes
public place
Essential for work