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March 17 is when Ireland celebrate St Patrick's Day. In the run-up to the holiday, JWT has created a poster campaign for Tourism Ireland, pushing the fresh air, open space and sublime landscapes of regions that include Galway's Aran Islands and the Glenveagh National Park in County Donegal. Running on cross-track posters across London Underground, the campaign encourages commuters to find the hidden St Patrick symbol and post their answers online to win a holiday. The strapline is: "Your very own Ireland".