The NHS links pre-dated David Cameron hiring Mr Crosby however it is the second time the Prime Minister has had to defend his controversial election strategist over claims of lobbying.
Mr Cameron has insisted that Mr Crosby had not intervened in policy decisions, but has repeatedly refused to answer questions about the extent of his conversations with the lobbyist.
The Prime Minister has come under sustained pressure to say whether Mr Crosby, whose lobbying company has also worked for tobacco giant Philip Morris, had spoken to him about shelving the plan for cigarettes to be sold in plain packaging.
More top news
After a largely fine and sunny start to the day a bank of cloud and rain is currently making its way southeastwards across Britain.
A woman gave birth to a baby boy on the hard shoulder of the M42 after getting stuck in traffic.
Dianne Abbott said the suggestion Labour had a 'problem' with anti-semitism was a 'smear'.