This is a love story. Superbly nuanced performances from Charlotte Rampling and Tom Courtenay and exquisite direction by Andrew Haigh, who also co-wrote the film, turn an apparently everyday story of a marriage in quiet crisis into something rather extraordinary. A subtle examination of the persistence of the past and the fragile (in)stability of the present, this is a portrait of a rock-solid relationship facing a fissure that cuts to its very core in the runup to the titular wedding anniversary.