This year on the plot has been a bit of a mixed bag in terms of dealing with two specific things, firstly our changing climate and the effect that is having on the growing calender, and secondly what we can best grow within this changing climate. Once again this year March was quite warm, and I took advantage of this and planted out lots of different salad leaves including wild rocket, land cress, sorrel, fenugreek, mizuna, mibuna and red salad bowl lettuce. By starting all of these salad crops off early we were able to eat these plants before the start of summer, whilst continuing to sow these seeds right through the year. The colder winters that we have been having the last few years has actually helped my overwintering garlic crop to produce bigger bulbs in the winter of 2011 running into 2012 due to the fact that the bulbs themselves respond to the cold ground as part of their growing cycle. 
The beginning of Winter 2012
I anticipated that this winter was also going to be a colder than usual affair so I have planted out hundreds of garlic cloves, leeks, onions and winter spinach, and the spinach in particular is doing very well and is frost tolerant up to around -5 degrees. It is now December the 12th and the winter spinach shoots are still coming up despite the lack of light and heat, this is one plant that I will certainly be growing a lot more of in order to get those fresh greens that are so good for us in the dark winter months.
Tips for gardening in our changing climate
Perhaps the best tip I would give on climate change gardening is to get keep an eye on the weather and what it is doing, this has helped me to sow and grow the things that I have been able to.Tip number two, our summers have not been particularly great in terms of ongoing hours of sunshine, so try and make your soil as healthy as possible so that your plants are in with a fighting chance when up against dwindling sunlight, this wont produce great results as the plants need sunlight as part of their growth cycle but it will at least mean that you are able to crop something, however small. When choosing tomato seeds for out current ill lit summers try and pick a hardy variery such as Sub Arctic plenty which can tolerate lower temperatures, gardeners delight are also fairly hardy to our climate so long as you put them outside during the middle of June. 
Steve