Company I worked for for 2+ years has closed down. What now?

So, yesterday my boss came in and told me that the company has been losing too much money for too long and they've made the decision to close the shop. I understand their decision to close the shop and hold no ill will to my now ex-employers as they were really nice and they took care of me extremely well. I think just due to the shock of realising I'm now unemployed I didn't quite soak in everything they had said to me. They mentioned my next payslip will have unclaimed holidays and all that good stuff, they had also mentioned something about a weeks notice yet when I asked "so am I needed next week?" They simply replied with a "nope". They mentioned they're gonna try reopen somewhere else later in the year if I wanted to work with them again and I effectively said "yes, if I'm still searching for work I would be happy to". Many of my friends and family have said that what they done was quite illegal and I should take action. Again, since they were good to me I don't exactly want to take legal action. However, after talking to friends and family and doing research online I believe I'm entitled to redundancy pay. I was made redundant once before during the very start of covid and everything was done from my employers side of things and my last payslip from that company had my wages, holidays and redundancy. Apparently, that only happened because of the pandemic and this time I have to apply for redundancy myself and get my employer to fill in a bunch of forms too. I don't really have much experience with this sort of thing even though I've been in the work force since I was 16 so I'm hoping you lovely people of Reddit could give me some advice. For those wondering, I currently have a few other jobs lined up but nothing set in stone yet so I'm not expecting to be unemployed for long so I don't plan on going on jobseekers/dole or anything like that.