Jo Morris meets three people who have turned their backs on lucrative careers and have chosen to retrain as teachers.
Recorded at various stages over the past academic year, hear how they cope in their first year and whether they've made the right decision.
How do they cope in their first year and do they have any regrets?
It's the spring term, and one of the trio is starting to have second thoughts.
'I didn't think it was enough to have 'made a lot of money' on my tombstone.
I want to make a difference.'.