They're going to have an 'extra guest' using an official twitter account to comment on the programme

They've chosen Toby fucking Young this week.
https://twitter.com/BBCExtraGuest

The rest of the panel:
Conservative Party Chairman Grant Shapps MP (he of the google blacklisting, fake name and breaking advertising rules)
Shadow Energy Secretary Caroline Flint MP
Liberal Democrat Deputy Leader Simon Hughes MP
poet and author Benjamin Zephaniah
Daily Telegraph columnist Cristina Odone