If you have received notice of dismissal by redundancy under the Employments rights act 1996 you are entitled under sections 52 to take reasonable time off work to attend interviews, reasonable is not defined, but two days off in the circumstances you describe is not unreasonable if substantial other time has not been taken off already, section 53 deals with your pay whilst attending interviews. Redundancy is one of the five potentially fair reasons for dismissal and you current employer risks you taking them to an employment tribunal for unfair dismissal if they do not permit reasonable time off to attend interviews.
I suggest you remind your employer of this and if you are a member of a trade union inform them.