They're Scottish, they do things differently up there Interesting name though and it seems that 'loof' in old Scottish is 'palm' so Cross My Loof would be 'cross my palm' which, I guess, is 'cross my palm with silver'

 

...it's also a place near Glasgow as has been said.

 

And a place near there sells yeast. And brews beer.
In fact, after British post tore open the Belgian yeast packet, I was still able to collect enough of them tiny little baqlls-o-yeast to make two starters, ending up with the Ukranian Belgian Syla Strength quarterly brew. @AHarper knows the story.