David and Jonathan Rowland
Rank 2017

Rowland, 71, and son Jonathan, 41, bought Luxembourg’s Banque Havilland at the bottom of the market in 2009 for £183m and in 2015 the private bank’s assets rose nearly £200m to £1.18bn. It also has a £161m holding in Mulberry, the luxury goods maker controlled by Christina Ong (qv), a £17m increase. London-based Jonathan’s internet investment company JellyWorks made the family £42m when it was sold in 2000. His former share trader father – known as Spotty – is a Conservative Party donor, who gave £245,500 to the party last year with a further £200,000 gifted at the start of the 2017 general election campaign.