Certainly not. By law. Biscuits are luxury goods, and as such are taxed appropriately, whereas cakes are essential food items, and have a lower tax rate. This culminated in a VAT tribunal in 1991 [0] where the makers of Jaffa Cakes argued that said items were cakes not biscuits, in order to get the lower tax rate. One of the winning arguments was that cakes go stale, while biscuits go soft. I think this could count as precedent for a proper legal definition of the difference between cakes and biscuits. (Of course, American-style cookies aren't biscuits either by this definition.)
Certainly not. By law. Biscuits are luxury goods, and as such are taxed appropriately, whereas cakes are essential food items, and have a lower tax rate. This culminated in a VAT tribunal in 1991 [0] where the makers of Jaffa Cakes argued that said items were cakes not biscuits, in order to get the lower tax rate. One of the winning arguments was that cakes go stale, while biscuits go soft. I think this could count as precedent for a proper legal definition of the difference between cakes and biscuits. (Of course, American-style cookies aren't biscuits either by this definition.)
[0] https://en.wikipedia.org/wiki/Jaffa_Cakes#Legal_status