The local shop got some flowers in for Valentine's Day including the
usual roses from Kenya. They also included a white flower which I've
been asked to help identify. I'd be grateful for help.

See
www.indaal.demon.co.uk/pictures/plant.html

Note, lower case for 'pictures' and 'plant'

It's about 45 cm (18 inches) tall, unscented.

--
Malcolm