JennyC wrote:

But quite possibly Ornithogalum narbonense
Thanks :~) Jenny

Not Ornithogalum narbonense Jenny, but O. caudatum AKA 'Sea Onion/False
Sea Onion'. The flowers of narbonense are larger and a more solid
white. They are also less numerous held on a shorter, less crowded
flower spike and the bulb is much smaller and subterranean. It is hardy
and rarely exceeds much more than 30cms.

In caudatum, the flowers are a translucent greenish white with a green
stripe, densely crowded in a heavily bracted, terminal raceme that
extends considerably as the flowers open so that the entire spike can
be up to 2m. or more in length.. It develops large green, onion-like
bulbs above ground level periodically forming small bulbets on the
outer scales. Originally a native of coastal regions of South Africa
it has naturalised in many parts where there is a similar,
mediterranean-style climate.