We speak to Dr Nick McKerrell, a constitutional law expert, about the Westminster government's use of Section 35 to block Gender Recognition Reform legislation passed at Holyrood.

- On what grounds can/have they done this?

- Is this an attack on devolution, or is it upholding devolution?

- Does Holyrood produce bad legislation? Why is it so subject to legal challenge?

- What are the politics behind the clash between Sunak and Sturgeon?