Cornwall, UK - Any tips for my little sandy plot?

Love this community, very excited.

Anyone familiar with UK native species? I am a foreigner and have a small little garden. I have abandoned veggies because they are too much work and we do not eat them fast enough. What kinds of things would thrive that are low-maintenance and help our local ecosystem?

It's really hot down here, can get dry and the soil isn't super great. The plot is full sun and the cats like to nap in it. We just had a fence replaced, and now it is ready to go again. It is under a dark garden cloth for now. We have berries, roses herbs and fruit in pots and in the ground. Our grape vine is absolutely mental for a hint on what would thrive.