hi there, i would phone up the company where you got made redundant asking why you have not recived your p45 yet, and then the new company you are working for ask them if you can fill in a p46 and tick the box that this is your only job, then you will be fine till you can give them the p45,the new company needs your p45 so they can see your correct gross pay from april so they can tax you correctly, but dont get worried your tax office will sort it out, but do get intouch with your old company asking what the delay is.