Carry over
There is no obligation for a company to allow you carry over holidays
In fact there is an obligation for your employer to make you take your holidays
This is to protect employees from employers who try to "force" their employees not to take holidays
(There is a six month period i think from the normal year end for carry over, but on this I am not certain)
So you may not be able to keep your carried over holidays
Also in relation to your suggestion to not take any holidays from now until your redundancy,
it is your employer that decides when you take your holidays
Your employer could force you to take any outstanding days prior to that date
I know none of this is good news but your employer can find out all of this information if they need to do also
You could contact the dept of trade and employment, for clarfication
They are extremely helpful over the phone