Can both parents take shared parental leave at the same time?

Yes, both parents can be absent from work on shared parental leave at the same time.

The amount of shared parental leave that the parents can share is 52 weeks, minus the amount of maternity leave taken by the mother, or adoption leave taken by the primary adopter. All leave must be taken before the child's first birthday, or before the first anniversary of the day on which the child was placed for adoption. For example, the mother could take two weeks' compulsory maternity leave followed by 40 weeks' shared parental leave. This would leave 10 weeks' shared parental leave for the father (or the mother's partner) to take at any time before the child's first birthday, either at the same time as the mother or when she has returned to work.