By Henry Saker-Clark, PA Deputy Business Editor & Lawrence Matheson Vodafone has agreed to sell its Italian business to Switzerland’s Swisscom for £6.8 billion. The mobile phone giant plans to give back £3.4 billion to its shareholders through a buyback after the sale. This comes two weeks after the telecoms companies first confirmed they were in talks about a possible deal. Vodafone, listed in London, said on Friday that this move is an “attractive valuation” and is the final step in its plan to sell off parts of its European portfolio. Swisscom will pay all cash for the deal, which will be f…