It is time to be thinking about planting new trees or maybe even grafting over old trees to different varieties. Its not difficult. If you have an established apple tree in your garden but are unhappy with the variety, you can graft it over using simple techniques and no equipment other than saw and sharp knife , plus a bit of polythene tape (you can cut some from a freezer bag) and some scion wood from the new variety you want to graft in. I will put some videos on YouTube soon about how to do it, its  too early to graft yet but not too soon to plan. You need to obtain the scion wood soon while still dormant, pencil sized and shaped 2007 growth, and keep it cool and moist until you graft in early spring.

The above picture was takaen in southern France and chows a very uniform orchard where the trees have been rafted over to a different variety.