SIR Richard Branson has dismissed rumours his daughter is dating British royal Prince William, branding the potential romance "a dreadful idea". Blonde beauty Holly Branson was linked to the prince following his split from girlfriend-of-four-years Kate Middleton in April (07). But her tycoon dad insists the reports are unfounded and the pair are "just good friends". He adds, "Nothing against William, but the life the royals lead, and the responsibilities that go with it are very difficult."