How do I become an STMS?

To become an STMS, you need to do the TTM worker course, then the TMO course, plus practical assessment. Then to STMSU for two days, then to STMS Cat A and Cat B, then to a practical assessment in both categories. That would be a day’s training in TTM worker, another day’s training in TMO, two days for STMSU, a day of each Cat A and B, then one day for practical assessments for both Cat A & B.