£28,464 starting. You will be on this throughout your classroom training, your handling at depot, and your summative assessments. In total this is about 34-36 weeks depending on where annual leave is factored in. Depending on your proximity to Derby, you will also be paid for travel on Sunday (as they are outside of the working week) which works out as roughly £110 extra per week.
Once summative assessments are complete you will move to £37,713 for around 8-12 weeks whilst you complete route learning for core routes. (This used to include traction training but I understand this has now been incorporated into initial handling, so the actual amount of time you're on this salary bracket may be less). The variance is due to different depots signing different routes etc, some take more/less time than others.
Once you sign a core route and traction, you will move to £54,977. One year later £59,990 and one year later again £65,006 (this is the top of the salary structure).