British Infantry Dress Sabre 18th Regt of What?

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This has the characteristics of a British cavalry officers levee sword and some of those of a Generals or Staff Officers pattern of dress sword . Both of which became 'official in the 1830s but were fashionable though unofficial shortly after the Egyptian campaign which finished in 1801 .The styles of levee swords are extremely varied though lion headed scimitar styles prevail . I cant answer your question re the regimental number . Is the blade not decorated as they usually are , that might give some clue . The picture shows a Lancer Officers Levee Pattern sword post 1832.