If you have children together, then i believe you have a claim, as his income has to contribute to your childrens welfare, but if you have no children together, then you have no claim on his redundancy.. The law changed in the 80's , where as a male /husband/dad. could not have his job/business/livelyhood/pension, taken away from him, on the concept of being seperated/divorced.. So if you are divorced, with kids, forget it. If you are seperated with kids, then i think you have a claim.
not sure if this helps, prob best go to advice centre, but if it were me and hed left me for some one else, F**k him off and move on, we women dont need their money anyway