Most horse feed places stock molasses I would think black treacle would work
I was thinking the same about Black Treacle, so much so that I have just made a few "Treacle Deer Licks".
What I have done as a "bit of an experiment" that I thought was wirth trying was to use a mixture of a couple of recipes from Youtube to make my own:
Ingredients used were:
1 full 454g tin of Black Treacle
1 full 340g of Peanut Butter
1 bag (1kg) of Table Salt
1 full (500g) bag of Raisins
1 cup of Porrige Oats
1 cup of Water.
(Total cost - Under a fiver)
I put the cup of water into an old pan that the wife was going to throw out (Not clever to use one of the wife's best pans) and bought it to the boil.
Next I took the lid off the tin of treacle and stood it in the pan of boiling water to thin it out enough to get it out of the tin more easily.
After a few minutes I poured the treacle into the boiling water and stirred it wel.
Once it was properly mixed and simmering I added the full pot of Peanut Butter and then stirred it in till it was mixed properly.
Once it was simmering again and well mixed I added the full bag of Raisins and 3/4 of the bag od Salt. Again I made sure that it was well mixed in and starting to thicken nicely. At this stage it needed constantly stirring it to stop it catching on the bottom of the pan.
When it all started to really thicken into more of a solid mass I got a couple of foil trays with lids (The ones you get your Chinese or Curry in) and poured half of what salt was left into the bottom each tray.
I then transfered the (almost solid) mix into the trays and left them to cool down enough to handle then and then put the lids on them.
All I have to do now is to allow a day or two for the "Treacle Licks" to really solidify and then put them out near where I want to try setting up a feed station (I have chosen a spot in a clearing just off one of the main deer runs through the wood where I have well concealed and elevated "viewing position" (about 100 yards away and accessible without the deer being aware of my presence) and wait and see if these "Black Treacle Licks" manage to attract any deer.
I'll let you know how things go in a week or so!
Another thing that might be worth trying is to use Molasses poured it into holes drilled into felled tree stumps (There's a good few of them in the clearing that I have chosen) as that is surposed to act as an attractant for roe deer - Might be worth a try also!