I think MLG might! I agree it's yummy - now who wants to make some & send it to me?! 
How'd you know?
Mr MLG complained I never make it anymore!
Here is the original recipe I have, courtesy of another Canadian in Britain (thank you, wherever you may be now:
):
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Tiffin Cake
1/2 cup (1 stick) hard margarine or butter. Don’t use marg. from a tub as it’s too soft and cake won’t set properly.
200 gram (1 large) bar good-quality dark chocolate (60% cocoa solids or above). If you have some milk chocolate to use up, like Easter eggs, you can use half dark and half milk, but all dark is better.
1 generous tablespoon golden syrup, or light corn syrup if you can’t find golden syrup.
2 tablespoons unsweetened cocoa (nice but optional)
approx. 8 oz, or 250 grams (or half a large packet) of digestive biscuits (Rich Tea biscuits or Hobnobs will work as well). I also heard that the equivalent weight in Maltesers malted milk balls is incredibly good as well, but I haven’t tried that variation yet.
up to 1 1/2 cups of a combination of the following: toasted chopped nuts, raisins, coconut, dried sour cherries or cranberries, whatever you have in your baking cupboard.
Method:
Melt the butter and syrup in a large, heavy saucepan, stirring carefully. Add the chocolate and melt. Remove from heat. Crush the biscuits into large crumbs. You want a few large-ish chunks but not too many or else the cake will just crumble when cut. Mix the crumbs into the chocolate along with other ingredients. Spread the mixture into a lightly buttered 8 inch square cake tin. Score into bars, then refrigerate ‘til firm. Serve in TINY slices—this is very rich but very, very good!
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My MLG version is Chocolate Ginger Tiffin Cake: crushed ginger nuts and walnuts / pecans (both, one or the other - whatever we have), 2/3 dark & 1/3 milk chocolate mix and butter. Simple is most effective and trial and error on the quantities always tends to turn out tasty, IME. I can't give quantity amounts, but started from the quantity amounts suggested in the above recipe!
Bon appetit!
