BMT & S32 power of advancement

I have a BMT client and the trustees want to use s32 power of advancement to make the capital date later (25-30).

Q - does this move the assets in to a discretionary trust or can an IIP remain?
Q - are there any tax implications of invoking s32 ie lifetime IHT or is it just a change to the existing trust?

Thank you

Lucy Orrow CTA TEP