Eucharis amazonica, Amazon Lily

E. amazonica is a bulbous perennial to 75cm, with narrowly elliptic leaves and erect stems bearing an umbel of fragrant white flowers, the stamens united at the base to form a cup.

It is a lovely house plant for foliage and stunning when in flower -- eight flower spikes above.
See http://apps.rhs.org.uk/plantselector/plant?plantid=2911 for the RHS description.

It will need to be divided soon (in Spring), when spare bulbs will be available.