Who leaked what was said at Windsor lunch over Brexit row?

Mystery shrouds the sources of reports claiming the Queen backed Brexit in a row with former Deputy Prime Minister Nick Clegg.

The Palace insists that the Queen is "politically neutral" over the EU referendum after the article was published, which claimed she backed Brexit in a row with former Deputy Prime Minister Nick Clegg.

The Sun newspaper cited a lunch at Windsor castle as the origins of the report.

The question being asked is who leaked what was or wasn't said at the Windsor lunch?

ITV News Royal Editor Tim Ewart reports: