The presenting line up for this year's RHS Chelsea Flower Show has been announced, with some presenter reshuffles, the return of some familiar faces and some new presenters. The shows will be broadcast across BBC One, BBC Two and iPlayer. This year there are some significant changes to the line-up, most obvious in the absence of regular presenter Joe Swift. Monty Don will lead the BBC Two evening coverage at 8pm as always, but this year he will be hosting with Rachel de Thame and Arit Anderson instead of Joe. Contributors will include Carol Klein, Adam Frost and Frances Tophill as well as a new presenter, Jamie Butterworth, who is also creating a dog-friendly garden with Monty at the show. Despite not appearing on the BBC coverage, Joe Swift has been at RHS Chelsea Flower Show this year, and his company Modular has been responsible for building The Pathway Garden, designed by Allon Hoskin and Robert Beaudin.…