Hi,
First of all, you should look up your union rep as the prev poster said.
However, how many people are being made redundant? If it's under 20 in a financial year, then they only have to provide 30 days notice. Over 20 and it's 90 days.
Secondly, if you were offered a second job and opted not to take it, then i'm afraid it's voluntary redundancy, as they have offered to a different position in the company and you have voluntarily refused to accept. In this case, you would have a much longer wait to claim unemployment benefit from the state.