firemanlover
I'm not sure you have any choice about informing HMRC as you can be fined for failing to report a change within one month.
As far as I can see this would a change to an existing claim with yno requirement to claim UC instead but this is not a benefit that we deal with on the forum so I would advise to get advice from a qualified Welfare Rights Officer.
Yes, from what I can see you would qualify for extra money now that he has HRC.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems