Some of the recent temperatures might kill off Laurus nobilis. I have wrapped my own small tree with two layers of bubble wrap (bubbles to bubbles). This tree is the very fragrant and edible variety of Laurus (provided you are sensible about quantities) and known as Bay. It was introduced to Britain by the Romans. I keep it to a very nice and very elegant conical shape by regular pruning; A little snip here, a little snip there. Twice a week is about right. It is evergreen. New spring growth is a bit feeble in taste and aroma. More unruly is rosemary. Rosemary is also evergreen.I do not need to give this winter weather protection. I have two varieties. One is the old fashioned type, and one is a trailing variation. Both have good aroma and taste. I also grow thyme. The leaves are not at their best in winter but still better off the shrub than dried. Sage also keeps its leaves in Winter but they are not as good as in summer. I do not understand why anyone doesn't grow these perennial herbs. I have a garden but they would grow almost as well in window boxes. I also grow flat leaved parsley and coriander. They are a bit more bother and run to seed a bit two easily if you let them get a bit dry in a drought. They are best treated as annuals but can be overwintered and are biennial.. Then there chives. Chives are a real pain to weed. If you get twitch(couch grass) in your chives bed then you might well kill the lot with weedkiller and start again. I don't grow ordinary chives because they are a bit too subtle for my taste. I grow garlic chives. Basil grows better in Italy than in Nottinghamshire. I still try. Basil is wonderful in tomato dishes. All these herbs make ordinary cheap food special.