CEO Secrets asks four founders what it's like to turn a small company into a huge one.
Paul Symington, head of the Symington Family Estates port wine business, shares his business secrets.
What kind of business advice do women really want?
Justine Roberts, who founded Mumsnet, offers the business advice she wishes she had been given before she started out, for the BBC News series CEO Secrets.
Jessica Butcher, the co-founder of Blippar, offers the business advice she wishes she had been given when she started out.