A redundancy situation is for the employer to decide you can't force it. In basic terms it is the job that is made redundant, i.e. the position is no longer needed. Then the problem then is what happens to the job holder. That is when you may get redundant. Refusing to do the job is not redundancy.
You can refuse to do the work on health and safety grounds, but if the company are following the government guidelines and they dismiss you for refusing to attend work and you take them to court they will probably win, obviously if they have not then that is different.
Your best option is to talk to the employer and discuss the issues, but the unfortunate reality is that companies are going to have to get back to work or they won’t survive. From August you will no longer be eligible for SSP for shielding either.

