You can prevent calluses to form by looking after your feet and choosing the right shoes to wear. Wear comfortable footwear that fit properly. Always shop for shoes in the afternoon, because your feet swell as the day goes on. This means shoes that fit in the afternoon will be comfortable. You should be able to move your toes inside the shoe with a small gap between the front of the shoe and your longest toe. If possible, avoid wearing heels as they increase the pressure on the front of your feet.
And don't put up with foot pain as if it's normal. If home care is insufficient to solve your foot problems, see a podologist directly or go to your GP, who may refer you to a podologist. They'll be able to investigate the underlying cause of your foot pain. Your GP may be able to refer you on the NHS, but each case is decided by your local CCG. If your condition is unlikely to affect your health or mobility, you may not be eligible for NHS treatment.