Could Britain withstand all Europe supporting Napoleon?

How would Britain fare if all Europe allied with France against it during the Napoleonic Wars?

Britain would face severe pressure, but its fleet support, access to colonial targets and continuing merchant trade could make the situation manageable.

Much of Europe already spent periods allied with Napoleon or participating in the Continental System. A more active alliance would stretch Britain, but its ability to build and support large fleets would still give it substantial room to respond. Enemy colonial possessions also offered targets whose capture could support the British economy. Nominally hostile European countries continued to need British merchant shipping. Trade therefore persisted through tolerated smuggling and changes of flag, weakening the practical force of commercial exclusion.