Unknown plant

Unknown plant

Observation - Unknown plant - UK and Ireland. Description: A plant given to my mother by a friend, no clue as to its identity or origin, at present it stands about 3ft6 to 4ft tall, single stalk with broad leaves as shown in the picture. All the flowers/buds are at the top of the plant in the cluster shown and ha

A plant given to my mother by a friend, no clue as to its identity or origin, at present it stands about 3ft6 to 4ft tall, single stalk with broad leaves as shown in the picture. All the flowers/buds are at the top of the plant in the cluster shown and have just began to open..
not a lot to go on but hopefully someone might have a clue as to its identity!