When it came to casting for the role of a free-spirited older woman, it isn’t surprising Celia Imrie got the call, writes Esther McCarthy.

Based on the private journals of Margaret Lynch Suckley, a distant relative of Franklin D Roosevelt, Roger Michell’s misfiring comedy recalls an important meeting between America and Britain on the eve of the Second World War.

O'Sullivan, one of the leading Irish directors from way back, is back on well-trod ground with this eternal triangle tale.