a quarter past seven
`` I 'll go and put on a clean collar . '' -LSB- Illustration : `` I 'll go and put on a clean collar . '' -RSB- Catesby watched him into his cabin and then , though it still wanted an hour to seven , hastily quitted the ship and secreted himself in the private bar of the Beehive . He waited there until a quarter past seven , and then , adjusting his tie for about the tenth time that evening in the glass behind the bar , sallied out in the direction of No. 5 . He knocked lightly , and waited . There was no response , and he knocked again . When the fourth knock brought no response , his heart sank within him and he indulged in vain speculations as to the reasons for this unexpected hitch in the programme .