Some basic questions

Hi,
Apologies, as the answers to my questions are no doubt here somewhere, but I can't find them!
I work as a teacher and have just been told we will lose 1 member of teaching staff by Sept.

1. I have a 'hobby' self-employed business I run from home - making very little - will this mean they count me as still working if made redundant?
2. After 17yrs full time, I went onto a part time contract after maternity for the last 5 months until the forseeable - I guess this will be the wage they use for calculations then??
3. Can our LEA make a less generous offer to what other teachers had last year, just because they are now even poorer??
4. Is there a cap on a 'week's wages' used for calculating redundancy? (if there was, I would feel better about the whole part-time thing!)
5. I assume that volunteering for redundancy makes you ineligible for any benefits once you finish work?

Many thanks in advance, and apologies for no doubt asking you all to repeat yourselves!

1) No. You are (if you are) made redundant from the teaching job - nothing else.
2) yes, unfortunately
3)Yes - what matters is the policy now, not what may have happened in the past
4) Yes in law. But public authorities tend not to use it. Redundancy is usually calculated on the basis of your wage.
5) No - redundancy is redundancy even if you volunteer. But having a part-time income from self-employment may - you would need to clarify that with a benefits adviser.