Russ,
It sounds to me that you are working you in a rough bar (pouring the shots
into a jigger and then into the shot glass). I’ve always used standard shot
glasses if it became necessary to use them. Because all of the bars I’ve
worked in used measure bottle pourers such as the one in this link
http://www.kegworks.com/shoppingcart/customer/home.php?cat=286 ,. virtually no
overpouring(unless they are messed up) and they keep a bar liquor cost in
check.
If possible you should think about buying some for yourself, than you will not
have to be double pouring shots.
You stated that you are in the UK, here are 2 British websites that carry them
DrinkStuff.com and http://www.thedrinkshop.com/
--
George
http://www.the-authentic-bartender.com/georgejr[at]transact.bm