Madam, – The article, “ Corporation tax: unravelling the myths” (Business This week, February 11th) had an extremely revealing graphic/table indicating that the effective tax rate in Ireland is less than that in France. Might I suggest the Government take out full-page advertisements, preferably Ryanair-style ones, in major French newspapers to demonstrate that Mr Sarkozy does not always have a firm grip on the facts? – Yours, etc,