Can a mother convert her maternity leave to shared parental leave even if her partner does not take any shared parental leave?
Yes, provided that her partner meets the earnings and employment requirements, a mother can curtail her maternity leave and take shared parental leave instead. There is no requirement for her partner to take a period of shared parental leave.
A mother might choose to do this so that she can take leave in a more flexible way than would be possible if she remained on maternity leave. For example, she may want to take three separate periods of shared parental leave, interspersed with periods back at work.