What are the five biggest UK takeover targets?

What are the five biggest UK takeover targets? With a weaker pound post-EU referendum, and the Kraft-Heinz bid for Unilever perhaps encouraging further M&A activity, can we expect other British companies to be targeted for takeovers -- and which ones are most likely to have sights set on them? Share Radio's Matt Cox put the question to David Buik, Market Commentator at Panmure Gordon, to speculate on the current business landscape in Britain, and imagine which companies foreign firms have their eyes on.