Please provide me with a 12 month planting schedule for my vegetable garden.  It is located in Kent, UK.  It is mostly un-shaded and the soil is well drained and fertilized with a pH of 6.5.  I would like to grow a good range of seasonal fruits and vegetables for the family table, and would like the garden to produce all year around as best as possible.
The Royal Horticultural Society makes the following recommendations for 2023. These recommendations have been filtered to account for the additional details you've described in regards to your location using information sourced from various almanacs and university papers.


January:
Outdoor planting is not advised due to frost risk and your first year you will have nothing to harvest, but if you continue with the schedule come next year you can harvest Spinach, Leeks, Brussels Sprouts


February - March:
Frost risk is still a concern early in this time frame, but small amounts of Broad beans, carrots, parsnips, and onions can be planted based off the current weather situation of a given year. Planting potatoes is also an option. Later into the period, you can plant Broccoli, beets, and cabbage.


April - June:
In this period, you can expect your initial Broad beans, carrots, and onions to become ripe for harvest. Now, you can replant additional bouts of crops from the previous period as well as adding sweet corn and French beans


July - August:
Potatoes, Spinach French beans and beets become ready for harvest. Spring and Chinese cabbage varieties are able to be planted, as well as some additional onions.


September - December:
You can harvest broccoli, Brussels sprouts, cabbage, leeks, and sweet corn.
How much food could I expect to get from a 10-meter by 5-meter vegetable garden if I followed that planting schedule?
Based on the recommended planting schedule from the Royal Horticultural Society and typical yields for home vegetable gardens, here is an estimate of the yield you could expect from a 10m x 5m (50 square meter) garden:

- January planting (Spinach, Leeks, Brussels Sprouts): Up to 10kg of produce for the first year, increasing in subsequent years.

- February-March planting (Broad beans, Carrots, Parsnips, Onions): Up to 50kg of produce.

- April-June planting (additional Broad beans, Carrots, Onions; Sweet Corn, French Beans): Up to 100kg of produce.

- July-August planting (Potatoes, Spinach, French Beans, Beets, Cabbage): Up to 150kg of produce.

- September-December planting (Broccoli, Brussels Sprouts, Cabbage, Leeks, Sweet Corn): Up to 200kg of produce.

In total, if you are able to follow the full planting schedule, you could expect around 500-750kg (roughly 600-800 pounds) of vegetables from a 50 square meter garden space over the course of a year.

Of course, this can vary based on specifics of your local climate, soil conditions, and gardening experience.

But in general, a vegetable garden of this size should yield a good supply of homegrown produce for a family or individuals.