The Prime Minister welcomed Mike Thornton, the new MP for Eastleigh - but only for the duration of this Parliament.
Two Lib Dem MPs - Martin Horwood and Sir Bob Russell - asked Mr Cameron about the Eastleigh by-election, and both tried to have a bit of fun at the Prime Minister's expense.
More top news
Tuesday morning's weather for the east of the region
Tuesday morning's weather for the west of the region
Simon's Blog - Haven't The Foggiest