Rosetta
There is no set (statutory) period for a redundancy consultation unless more than 20 employees are impacted over a 90-day period and collective bargaining rights apply.
However the employer must operate a fair process. In assessing the fairness, an ET would look at the scale and complexity of the process, but 30 days is probably typical. It must include enough time for individual discussion to occur with each person impacted.
Yesterday SHOULD have been the start of the consultation process from what you say. During the process, it should emerge when specific individual's employment will end. It does NOT have to be everyone at the same date. For example, if volunteers are sought, it is perfectly feasible that they get dealt with first and leave first.
During the consultation, your husband must receive written confirmation of what his situation is (redundant or not) and when it applies from. That date is the date from which the notice period (or money in lieu of notice) would have to be paid.