Yes I thought that but I don't know quite how the clue gets to it. Albeit Heath is a former PM. There are only about 6 place names beginning with 'I' with the setting (4,5) and I guess this ones the nearest. Thanks
No complexes,please! Maybe sometimes we just have the right reference books. And everybody has their blind spots occasionally. Don't give up: I think it's all a matter of experience. And some are much faster than me.