Teaspoon of sugar and a glug of olive oil, massage heel with this mixture for 5 mins, wash with warm water and pat dry, apply CCS foot cream if mine is really bad (splits every winter where I got glass in it 30 yrs ago!) I then wrap it in cling film before going to bed. Apply the foot cream every morning and night , I also use one of those ped egg things to keep the hard skin in check. Tend to do this all year round now and find it will,only split once or twice rather than on a weekly basis in winter, you have my sympathy, it hurts so much!