Its only a rough guide. Sometimes things have to move as either I've run out of space, or have extra space as something hasn't worked.
So the provisional plan for 2012 goes something like this:
Nothing should have been planted in the same location in the past 3 years. So far I haven't come across a huge number of plant diseases, but the whole plot is plagued by white fly (which I'm fairly sure will survive a nuclear winter) and flea beetles.
My aim is also to plant lots of summer annuals such as French Marigold, Calendula, Sweet Peas, Cornflowers etc. and dot them amongst the crops. Hopefully to attract in insect pollinators and also because they look lovely too. As I left most of them to seed this year I'm hopeful that I wont need to grow many from seed on purpose, but just move them from where ever they germinate. The same goes for the sunflowers (none of which were planted on purpose but all came from self seeding). These provided some windbreak for the plants this year as it is quite a windy site, and also good for attracting pollinators in.
Round where I plan on planting the peppers and aubergines I'm going to construct a roofless 'greenhouse' made from used squash bottles. Its an experiment and we'll see what happens...