"I would support the notion of 6 months mat leave and 6 months parental leave, to be taken by either parent, as this would go some way to levelling the playing field in employment terms."
Why not go all the way and drop the maternity leave and just have 1 year of parental leave?
With your proposal men would only be able to take 6 months while women could take a year, hardly equal and it still leaves employers liable to panic about women taking longer absences than their male colleagues and to secretly recruit accordingly.
True enough I'd expect that it would normally be women who would take that first amount of time off but why not give parents the choice about that? Most of them are pretty responsible people and might have all sorts of work commitments that make it tricky for the woman to take 6 months off.
With just a year of paternity leave the woman could go back sooner, if that's what the parents want, and the child would still be able to have a parent with them for that first year as the father could take what was left of the leave.
There would have to be some work done, things like perhaps not allowing both parents to be off outside of the first few weeks and decreasing pay, but why not give parents the choice and the power?