So the code worked and it seems like my F&P LPA has been put onto the new system early, essentially, so I'm sure I can use the code for other orgs if necessary.
I just got off the phone to DWP and have registered the LPA with them, told them Dad is in care and has been assessed for LA funding and has got it, and finally, found out why his pension was stopped - it was as some suspected, that they couldn't get hold of him and didn't know where he was. Similar to what happened to
@Bella6 's mum I think but I don't think we'll have forms as I've registered the LPA. I understand they will send info to me now.
Thanks for all the responses - I was quite overwhelmed with work last week but as it's eased off now it's seemed a lot less of a panic.
I believe that DWP will reroute most of his pension (leaving only the spending money) to the LA. I will no doubt find out for sure eventually but the chap on the phone seemed confident he knew what to update and had all the info.