Here it is.
The ships are:
Rainbow (22) - Inferior 6th Rate, Veteran crew, Hull/Guns 7, Gun Class A
Avon (16) - Unrated, Carronade-armed, Veteran Crew, Hull/Guns 5, Gun Class E*
This can be fought on a 3' x 3' area. The wind is coming from the south. La Nereide is in the SE corner heading NW. Rainbow is in the SW corner heading NE. Both ships start 6D6cm from their respective corners. Avon is not on the table at the start of the battle.
At the start of each British Action phase roll a D6. On a '6' Avon is placed in the SW corner, heading NE, and moves normally that turn.
On the whole this heavily weights the scenario in favour of the French, who have a chance to take out the smaller British ships one at a time. A game-orientated British player will obviously avoid combat with the Rainbow until the Avon comes up, but where's the fun in that?
And the replay? La Nereide gave Rainbow a right royal battering. Avon took a long time to appear, piled on full sail to get into the fight and was defeated very rapidly, leaving La Nereide to then finish off Rainbow. Much of the battle was fought in a strong wind, which made accurate maneuver difficult.