Millionarie art collector Charles Saatchi is to auction 50 of his best-known sculptures and installations.

Proceeds will support continued free entry at the Saatchi Gallery in London and free programmes for schools.

The move has sparked speculation that Mr Saatchi is seeking to rebuld his reputation in the wake of accepting a police caution for assaulting his wife, Nigella Lawson, in June. The couple divorced last month.