518 Hougoumont (18 June 1815)

no - temporary banners are only gained and held for as long as the condition is met at turn start. They are not cumulative. They are lost immediately the condition is not met.
Permanent banners can be cumulative if the condition can be met multiple times (e.g. per unit that exits)

in Special rules 2 & 3 the condition is vacant, i.e no not occupy. Does a Leader count as 'occupying' for the purposes of cancelling this condition?

All kind of "Objective Victory Banners" can only be fullfilled by units and not by Leaders (remember rulebook page 7, left colum
" A Leader is not a unit, and is represented by a single block."
except, the scenario notes described it explicit otherwise.

Richard Borg, 2017-05-14

Do the Hanoverian lights with 4 blocks shoot with 5 dice in ranged fire then, as they have an extra block?

"Do the Hanoverian lights with 4 blocks shoot with 5 dice in ranged fire then, as they have an extra block?"

Yes.

French delivered a beatdown. Granted, my opponent in new to the game, and did not get his lights or Guard Grens into action early enough. The took the treeline on the right flank while Foy moved inbetween to advance into the orchards. British countered with a bayonet charge to keep Foys advance at bay, and even destroyed his unit and leader. However, it was not enough as my lights were in great position for return standing fire. I began to swing my left flank into my center to avoid the British artillery.
After moving into the walled gardens, Brits were able to attack twice with the Guard Gren but only delivered 1 hit on 12 dice. After that, the British were eradicated. 8-3 victory for the French

Played last evening with the young Leon :
Two allied victories : 8/5 - 8/1
The 2nd game was very quick (4 turns) : Allied played cards :
Coordinated Attack
Forced March
Forced March
Bayonet Charge