Our member Shirleytulip lives in West Sussex but not as near to the sea I think, you could look at her pages, Tamarisk is supposed to be good by the sea I think, sea holly of course, thrift, mauve or white is pretty....

When I lived on the north east coast the gardens there often copied the nearby sand dune planting with swaying grasses and rock beds.
The RHS do a good page on this subject on their site and with windbreak plants and or hedges to add protection their list is quite long.

When we lived in Devon we had; Escallonia, Potentilla,
Rowan trees, Hydrangeas, Clematis,Grissalinia Littoralis, Japenese Anenomies,Day Lilies.They all did well.

Thank you all for your answers, should keep me busy for a while making up my list

There is a website dedicated to seaside plants which should give you more ideas..

Crambe maritima, sea kale, will also thrive.

Many thanks, have also found the seaside plants websites, very useful