Thanks BB! Is that an all in one day job (as in top dress immediately after scarifying)?
I mowed this evening only a few days after the initial mow. Lowered the height to 20mm (measured by putting a straight edge between rollers and tape measure to top edge of bread knife blade). Filled a large Sulo bin with grass. Was lucky to be mowing for 2 minutes before needing to empty catcher. Scalped most of the lawn and looking not very green now. Raining now. I will try to take a photo tomorrow.
I discovered my (pretty powerful backpack) blower is a good way to clear the lawn of anything short of large sticks before mowing, so that is quicker than raking.
