Sorcha, A toff is a nob, more or less; "toff"="toffee-nose", i.e. "one with his nose in the air", and "nob"="noble/nobility". Neither expression is derogatory per se, and both mean an upper-class or well-heeled person, usually a gent[leman]. "Toff" can also be used metaphorically to mean a decent or generous person, as when a cab driver might say in response to an unusually large tip, "Cor stone the crows, you're a toff sir, an' no mistake." Well, he might in Mary Poppins! (More likely "Get me sarf o' the river this time o' night, I expect more than a bleedin' Lady Godiva!")

Steve