It’s not too early in the year to do gardening!
If you like digging (rather than using no-dig growing methods), you can do so now if your soil isn’t frozen or water-logged. Dig compost into the soil if you have any. Soils benefits from “settling” at least six weeks before sowing or planting!
In protected and sunny patches you can sow: broad beans, kohlrabi, parsnips, peas, radish, spinach.
Under cover (cold frames may do) you can sow: beetroot, broad beans, many brassicas, leeks, lettuce, onions.
– From “Grow your own vegetables” by Joy Larkcom