That's a small space - you could fill it with a couple of low maintenance shrubs such as Skimmias, or one Mahonia aquifolium and some ground cover. Or a couple of Spiraea 'Goldflame', though these are deciduous. Ground cover plants are low growing, spreading plants which simply cover the soil and suppress weeds whilst (hopefully) looking good year round - Helianthemum (sun), Arabis procurrens, Iberis sempervirens, Ajuga reptans (shade) are examples.
If you want low maintenance, shrubs and ground cover are the best way to go. Oreganum vulgare 'aureum' is a herb and makes a good, wide spreading ground cover at a height of around 3 inches, but like most herbs it prefers a sunny position (or at least half a day's sun) and free draining soil. Other herbs which are hardy in the UK and perennial are Chives, Thyme, Sage (though it looks tatty after winter and will need cutting back in spring) and Rosemary, but the latter becomes a large shrub (up to 2m wide and a little less tall) over time which will fill the space you have on its own.
Whatever you decide to plant will not be low maintenance initially - at this time of year, you will need to keep them well watered up till late autumn, and employ the hoe to keep down weed growth until the plants have settled in and started growing/spreading.
Vegetables generally need sun, and obviously, need a lot more tending and care if you expect a crop, and ongoing you will be planting those every six months or every year, depending which vegetables you choose.