Normally they send list of documents they require at the time of interview.....if your sent already original documents then don't need to send it again.......yes these two updated forms imm 0008 ie and 5406 have to submit again.......and also check out other documents that they listed on (Interview instruction letter in PDF) that attached with email....
Degrees and Transcripts that you already submitted original...that is okay but Travel documents, Employment Reference letter(updated), Three new Pay slips, Updated Bank Statement or Letter...Birth Certificate....these all original should be bring with u......and all other docs that u think is important take with u.......
If your old file no. is Bxxxxxxxx and new file no. that change is also Bxxxxxx don't worry now use this new file no in your reply for confirmation of interview (In my case my old file no.start with "Exxxxxxx"...and new file no. start with "Bxxxxxx") ....if u need any more help ask me.....
thanks