Try this. Find yourself a slight hill with no cars parked on it. Switch off your engine and pump the brakes half a dozen times to exhaust the servo. Let your handbrake off so that the car rolls downhill. Try to brake and steer it. Let us know how you get on.
MAKE SURE YOU LEAVE THE KEY AT POSITION I, or the steering would be locked.
Last time I was towed was off the M62, new company car and the engine ECU had failed, at speed in L3. I managed to get it through traffic to the hard shoulder with the dead engine, then call breakdown. RAC, after confirming it, hooked their rigid bar on it, to take me to the nearest dealer. The bar had to be at an angle and every time he braked, it would try to force me out to one side. Quite scary with no power steering or brakes, but we got there.
Time before that, different company vehicle, the gear lever linkage failed. It was a common problem apparently and fixed within the hour, without need for a tow.