Doesn't matter. Under employment law, you are paid for your notice but you are still given notice. Could they take their packages of redundancy and then apply for a job at CHC in Norwich, yes.
CHC did not make them redundant because they wanted to, they were made redundant because they had no work for them.
Legally still employed perhaps but serving notice under redundancy is very different to normal continual employment. That's why they'll probably lose.
Where is Flying Lawyer when you need him/ her?