I have three cognac+suze in my list. This one (L'Heritage), the Charente White Negroni (which I see you have already tried and liked). The third is the Vieille Place... (halve the sugar)

The ability to filter on base alcohol and Hall of Fame has since been added the the Cocktail Finder, as part of a major increase in functionality in 2025.

Keep the empties. Decant your litre into them (fill well). Store in a cool dark place.
(I'd also decant the last 250ml into a smaller container, to minimise the surface area exposed to the oxidising air)

The UK uses "units of alcohol" -- basically the %ABV multiplied by the volume, which gives you the alcohol content:
A 25ml shot of a 40% abv spirit is 25 x 40 / 1000 = 1 unit.
To get the units of alcohol in a drink, sum the units of alcohol for each ingredient //
1.8 - 2.0 is at the light end for a cocktail ; 2.6 - 3.0 getting hefty ; 3.6 - 3.9 caution required, and the upper end for anything on Difford's Guide (that I have seen).