1) Check stakes and ties. Make sure the supporting stakes have not rotted off at ground level. Loosen ties where needed, if too tight.
2) Start pruning apple, pear and mulberry trees that have reached regular cropping.
3) Check that rabbit and deer guards are in good working order.
4) Check fruit in store. Remove rotten fruits
5) Apply farmyard manure where trees have been struggling
6) Cut out dead branches and canker wounds. Paint wounds with Arbrex or similar.
7) Apply winter wash if greenfly/aphids were a source of trouble last year.
8) Protect fruit buds of plums and pears. Bullfinches can cause serious damage during the winter months.

Bullfinch, photo courtesy of Jacob Spinks/flickr.com