Guidelines from City & Guilds, who administer the NRoSO scheme on behalf of the VI, can be found here:
Likewise, NSTS has also published guidelines on it's website:
COVID-19: NRoSO and NSTS publish contingency plans
02 April 2020In light of the current COVID-19 coronavirus restrictions, NSTS and NRoSO have published contingency plans for members.