seastar, you have every right to enquire as to what is happening in regard to your furlough, and your employer would be under a legal obligation to reply to such a request. Should your employer decide there is a redundancy situation within your workplace, then the situation becomes far more complex.
To try quickly and simply to give details on that, your employer in a redundancy situation must bring forward what is known as "a criteria" which is applicable to all staff. That criteria must contain (by example) the amount of absenteeism an employee has taken, disciplinary record, training sessions missed along with virtually anything that is applicable to employment within the company.
The results of the above must be compiled in numeric form and obviously, those with the highest totals are those who will be made redundant. Such matters as employees who are shielding may be added to the above criteria if the employer decides so, but that may leave them open to challenge via other employment legislation.
Any employee can request to view the redundancy criteria and the score they and others were given when applied.
The above is a very brief overview of the redundancy legislation, and I would very strongly advise you seastar or anyone else who becomes involved in redundancy measures to inform their trade union if they are a member of one.
Hope this helps.