Hi there, as I have not heard from you regarding the phone call and I am no longer making calls from now on this evening, I will reply here in writing instead.
First of all for redundancy to occur the job does not have to disappear - the employer only has to show that there was a reduced requirement for employees to do a particular role. SO the job could still remain but it is just that the employer does not need as many people doing it, so they are reducing the number of employees that do it.
In terms of redundancy payment, that depends on your continuous length of service, your age and your pay. You can calculate your entitlement here:
If you find that you are entitled to more than what they have offered then obviously you should not consider accepting that as legally they have to pay you the calculated amount.
The employer can ask you to stay for as long as necessary, up to the length of your contractual notice period. However, this should be reflected accurately in the settlement agreement. So if they wanted you to stay until 28th, which they can do, they should change the agreement to say that as well.