There is an exhibition on London's Italian community at Camden Local Studies and Archives Centre, Holborn Library, 32 - 38 Theobalds Road, London WC1. It covers the history of the community from its origins in the early 19th century until its decline after the Second World War. If your ancestors lived in or even passed through England then they probably had some connection with this place.
Exhibition runs till 27 September 2008.
See www.camden.gov.uk/local historyfor details.