If you watched any of the BBC coverage of Chelsea or if you saw Gardener's World last night (Friday), you would have seen Joe Swift clutching his namesake, Dahlia 'Joe Swift'. Elegant, understated, clean and crisp - the obvious name choice, really ;-).
Alan Titchmarsh has a whole garden named after him - a Dianthus, a Fuchsia, a Hosta, a lupin, a sweet pea and a rose. (However, not just plants are named after famous people).
Poor Alys Fowler doesn't yet have a plant named after her. So, what type of plant should be named after the lovely Alys? SomeBeans suggested a hop, perhaps because of this blog entry.