Yes, it is possible to switch from a tracker mortgage to a fixed-rate in the UK. Some lenders will allow you to switch from their tracker mortgage to one of their fixed-rate deals without paying an early repayment charge. Conversely, if you want to move to a different lender, you may have to pay charges and additional fees. The availability and terms of switching will depend on the specific terms of your existing policy, so it can be advisable to consult with your lender or a mortgage adviser to explore the options and implications before making any changes.