Employment and health and safety laws in the UK do not differentiate between workers according to whether they work in an office or at home. Your employment status does not depend on where you work but on a whole range of factors.
In 2002, a European voluntary agreement on teleworking (what we in the UK normally call 'homeworking') was developed, but this is not legally enforceable and has not been implemented in the UK. Instead, it provides a useful 'a good practice guide' for employers and workers.
If your employer decides to make home working a more permanent arrangement, beyond a short-term response to the 2020 global pandemic, there will be a number of important issues to consider. It would be a good idea to talk with your trade union representative (if you are a member of a union).