4 year crop rotation plan

Here is my 4 year plan - drawn up from all over the place. It's only intended as a starting point as I know some people don't like rigid plans:

Year 1
(Solanaceae)
Spring/Summer
potatoes tomatoes peppers aubergines
Companionsnions nasturtium marigold parsley cucumber
Soil requirements:No lime; plenty of manure and organic matter in spring. Follows:Brassicacaceae

Autumn/Winter
Autumn planted nions garlic leeks green manure

Year 2
(Alliaceae & Umbelliferae)
Spring/Summer
garlic carrots leeks celeriac onions celery shallots fennel parsley parsnip Companions:sage tomato lettuce rosemary
Soil requirementsnions: organic matter; moderate fertiliser; woodash
roots: no fresh organic matter; moderate fertiliser; little water Follows:Solanaceae

Autumn/Winter
Autumn planted :Grazing Rye or Phycelia

Year3
(Leguminaceae)
Spring/Summer
broad beans french beans runner beans peas clover winter tares
Companions:radish cucumber sweetcorn turnip
Soil requirements:Plenty of organic matter; not much fertiliser; water when pods forming. Follows:Alliaceae & Umbelliferae

Autumn/Winter
Autumn planted :Winter tares

Year 4
(Brassicaceae)
Spring/Summer
broccoli brussels sprouts cabbage cauliflower radish swede turnip Companions:beetroot spinach onion family
Soil requirements:Alkaline soil and plenty of fertiliser.Apply leaf mould in Autumn. Follows:Leguminaceae

Autumn/Winter
Autumn planted :Winter brassicas

Anywhere
spinach beetroot courgettes squashes lettuce radish cucumbers celery sweetcorn melons