In the early 1970s I was undergoing an RAF flying scholarship at Ipswich. The airfield and duty runway were shared, one side gliders, the other side powered aircraft. I was flying a dual circuit consolidation sortie and was downwind when the glider tug, complete with tow cable, and without any radio calls being made, cut diagonally into the circuit right in front of us. The cable end was only a few feet in front of our propellor.
My instructor took control and took necessary violent evasive action. Had I been solo I'm not sure that I could have avoided the cable.
He landed, taxied up to the glider tug, told me to carry on solo and got out to remonstrate with the pilot. After I landed I learned here had been fisticuffs because the tug pilot was completely unrepentant and waved him away.