SDP transitional protection

Going from a single claim to joint is classed as a major change of circumstances, so Transitional Protection ends.

https://www.scope.org.uk/advice-and-support/transitional-protection-and-universal-credit?gad_source=1&gbraid=0AAAAADrhH8H7h0bW-vg38GN3Bz6rCAgwh&gclid=CjwKCAjwwe2_BhBEEiwAM1I7sce5mdvEG-eVVDeH7VZfqXHbmx8uBS1spGjzjERvIeO03lW3udPzlBoC97UQAvD_BwE#If-you-make-a-joint-claim-with-someone-who-gets-Universal-Credit-click

Even though you've lost benefits, it's cheaper living as a couple running one household, than living apart running two.

From the link given:

If you make a joint claim with someone who gets Universal Credit

You cannot start receiving the transitional element if you make a joint claim with someone who already receives Universal Credit.

For example, you would not be eligible if you moved in with your partner who receives Universal Credit.

Your circumstances are now based on a joint household under Universal Credit. He isn't entitled to Transitional Protection from his previous ESA claim I'm afraid.

Also in a couples claim only one LCWRA element is payable.

A possibility is whoever isn't being paid for LCWRA element, claims Carers Element for looking after your daughter (the same person cannot get both LCWRA and CE paid).

This is £201.68 a month

I'm not talking about Carers Allowance, which is deducted in full from your UC award.

I'm talking about Carers Element which is an element of UC like LCWRA.

https://www.turn2us.org.uk/get-support/information-for-your-situation/universal-credit-uc/additional-elements-of-universal-credit-uc

If you already get LCWRA you shouldn't be getting payment for Carers Element, because the same person entitled to both only gets payment for the higher amount which is LCWRA.

Which is why I suggested the person not getting paid LCWRA applies for CE.

Please note I'm referring to Carers Element not Disabled Child Addition which is paid alongside LCWRA.

Assuming it's your partner not getting payment for LCWRA, you can ask for Carers Element to be backdated to the date he moved in.

I'm not 100% sure, but if he's not being paid for LCWRA under UC then he should still qualify for Carers Element, even if getting paid New Style ESA.

You could check that with a trained benefits advisor locally:

https://advicelocal.uk/welfare-benefits

I believe you need to log into your Journal, select Report a Change, Caring for someone, and input the details.

You may be asked reason for "late" reporting of the change.

This would then go to a Decision Maker to consider.

If they refuse backdate, you can ask them to look at the decision again (Mandatory Reconsideration), and later appeal to an independent appeal tribunal if still refused.