Oh, well they make that up in order to fleece people.
I remember many years ago (30!
), when I first started visiting Staffordshire, I had a Metro that kept breaking down. A friend of my step father in lawās was a mechanic and had a look at it in the drive as a homer. He was chatting away to me and told me if he was me heād do something or else (I forget what now) to āsave the mytherā. Thinking this was a term like ātorqueā or something, and not wanting to show ignorance, which might cost me money, I nipped inside to see if Bill or my partnerās grandad (a retired lorry driver) knew what it meant. They both laughed out loud. It means āthe hassleā. Which I now know. But I never lived it down while they were both alive.