Epic Tea Biscuit Fail!

I have been baking for a long time so I know my way around the kitchen fairly well. One recipe I have never been able to conquer though is the tea biscuit. It's one of the few recipes that I have from my Grandma and while she made it often, when I make them they always turn out poorly.

So recently, I decided to try again. I read up on tips on the Internet on how to have the highest, lightest, fluffiest biscuits instead I got this....

 

concrete door stops!!!! If you have any ideas for me, drop me a line. I'm off to bake some shortbread.