I was intrigued to know what was this colourful plant amid the marram grass on the sand dunes at Southport.
A bit of research shows that it is sea buckthorn. It is the plentiful berries that are so colourful, lit up by the low November sun. Like the marram grass itself, sea buckthorn has an extensive root system that is able to cope with the extreme environment of the sand dunes (which also helps to stabilise the dunes).
The featured image shows the berries, leaves and thorns closer up.