The Lighthouse Keeper's Lunch

Every day, Mr Grinling the lighthouse keeper cleans & polishes his light to make sure it shines brightly at night. At lunchtime he tucks into a delicious lunch, prepared by his wife. But Mr Grinling isn't the only one who enjoys it. Can Mrs Grinling stop the greedy seagulls stealing the lighthouse keeper's lunch?

Where can I find a copy?