You can be sure that the pipers did not go thirsty! They would be back in a wee room waiting to be called in for a few more tunes. If they were done before one in the morning, I would be very surprised. I had the pleasure to meet P/M George Kilgour (his picture is in the Scots Guards book, vol. 1) at the Queen's 50th wedding celebration at Earls Court where we surprized her majesty with 96 Scots Guards pipers and drummers, past and present - I have rearly met a more likeable man! Also present were P/M's Angus MacDonald, Jimmy Banks, Dixie Ingram and a host of other pipers who could have won medals anywhere if they'd had the inclination!
Pipers: The golden rule when working with a reed is, "You can always take material off the cane, but you cannot put it back." So, remember, when removing the slightest amount of material, blow the reed again.