The Tortoise Table

So coming from my last post (thanks again Nina :D) I have another plant to identify. The problem is that it's a big patch of mint, and frankly I've no idea what kind! I obviously want to be quite sure it's spearmint before I try feeding it to tort. It's growing outside my front door in large patches...

that's fine thank you Nina for the excellent response!!

So sorry about this, Raspberry Sam, and please see my response to your post below. I accidentally deleted your text (your photo is still there though) and can't get it back! Really, really sorry about that, but I hope the answer helps and sorry that it has been posted twice -- it's not my night! Tha...