No.10 rocked by secret love affair: Anyone know who it is yet!!!
Identities of people involved or details of relationship cannot be disclosed
They are middle-aged figures and the affair has now concluded
Mr Cameron was â€˜stunnedâ€™ when told the identities of alleged lovers
He â€˜immediately realised the importance of the storyâ€™, sources revealed
'None of us could believe it when we first heard it' said senior source
It is understood that the Prime Minister was told of the relationship - which does not involve anyone serving in the Cabinet -