Does car insurance cover misfuelling claims?

• Filling your car up with the wrong fuel can cost hundreds of pounds to fix 
•  But only one in 10 car insurance deals covers the cost of a misfuelling claim

I have car insurance with LV and it claims to cover misfuelling. However, having recently accidently done this, I tried to claim the £210 cost back. 

LV rejected my claim on the basis that I had first called Green Flag, my breakdown cover company, and not LV. 

I can’t recall reading this specific requirement in my…