There needs to be progressive pay. As PP said, the starting salary is not bad, comparable with some other graduate programmes. However, you often reach the highest "ceiling" within a few years - the pay for experienced teachers is often only £10-15,000 more than the starting salary. What seems like a decent salary when you are young and single becomes insufficient once you want a house and family.
However, as is typical with the current government, there is no long-term thinking. School budgets are too low to retain experienced teachers so even in the time of a recruitment crisis, older experienced teachers are still being "managed out" because schools can only afford to pay the lowest salaries.