A fixed rate mortgage guarantees you a specific rate for a period at the beginning of your mortgage; usually 2,3 ,5 or 10 years. During this time, your rate will not change.
A variable rate moves in line with the lenders standard variable rate which usually reflects any changes in the Bank of England base rates.
A tracker rate is a set margin above the Bank of England base rate. If the base rate rises, so do your mortgage payments and vice versa.
Discounted rate mortgages have a set discount off of the lender’s standard variable rate which usually reflects any changes in the Bank of England base rates