ISO Choc Chip Cookie copycat recipe
"Distinctive and interesting spice."
"Hint of spice, but not overpowering."
Spice in choc chip cookies? What kind of sacrilege is this? ;)
Seriously, though, the first thing you want to do when copycatting a recipe (or looking for copycats), is to find a list of ingredients. A list of ingredients will help you weed out the copycatters that know what they're doing versus the copycatters that are flying blind/guessing based on taste.
Pret a Manger is probably just corporate enough to provide a list of ingredients for those customers that request them. I think that would be your best base to start from. If need be, play the 'my cousin has special food allergies and I want to ship them some' card.
I don't know much about Max Brenner, but I would take the same approach with them. Hopefully you can talk to someone nice who will go to the back and get the ingredients for you. Maybe call them when they're not too busy.
Btw, Max Brenner's website has a cookbook featuring chocolate. It's a bit of a long shot, but the recipe might be in the book. I'd call them and ask.
And, this may not be much of a help, but Pret a Manger has some nutritional information: