Reviewed by Alexander Lucie-SmithLIBERTIES PRESS, 224pp, £12.99Tablet bookshop price £11.70            Tel 01420 592974I  have been reading Mary Kenny for years, ever since I began to read the newspapers. Then, back in the 1970s, she had a column in The Sunday Telegraph. As a boy of 13, I would always turn to that column first thing, and never found it anything less than fresh, original and thought-provoking.And so it has been over the last half century: Mary Kenny has produced a huge amount of work, as well as some very well-regarded books, and never, as far as I can see, written a dull sentence. No wonder, as she tells us in this memoir, that on the occasion of the Queen’s state visit to Ireland, she got a kis