His follower waited for him outside.

It was possible that he would take a hansom and drive straight to the House, but Andrew had reasons for thinking this unlikely.

The rain had somewhat abated.

Lord Randolph came out, put up his umbrella, and, glancing at the sky for a moment, set off briskly up St.Martin's Lane.
Andrew knew that he would not linger here, for they had done St.
Martin's Lane already.
Lord Randolph's movements these last days had excited the Scotchman's curiosity.

He had been doing the London streets systematically during his unoccupied afternoons.