Wish Upon a Star by Olivia Goldsmith
When Claire sets foot on British soil she falls head over heels in love -- with a country. From red double-deckers to afternoon tea, she's finally found her home. Friends, family and even Michael are abandoned as she rents a room and sets out to make a whole new life as an American in London. But she reckons without the obstructive efforts of a very strait laced Englishman