E10 in 7.5 Golf R

[mattyf83]

Hi Guys

I just got a dreaded text from my wife. "I just put half a tank in your car, E10 like you like"

Obviously the car is recommended 98/5 and has only ever been filled with 98. How likely is this to cause an issue? Would it be better to fill the rest with 98 increasing the octane? or use the E10 to get the ethanol out of the tank quicker and then fill with 98?

Thanks guys.