Hi Builder. Just finished the floor levelling. Turned out brilliant.
Bit of a panic at first as I hadn't used enough water and it was like spreading tar. Bunged it back in tub and added more water. From then on was straightforward.
Flowed like magic. Actually very therapeutic spreading with the trowel.
Ran spirit level over it this morning and all good.
Many thanks for the advice. Now ready for my laminate floor laying!