That's great Richard.
116k is a high mileage so it may be that brush wear is responsible for your loss of all speeds, particularly if the air conditioning has been run continuously during the car's life. To find out we will need access to the fan control box which means taking off the front bumper assembly. This isn't as daunting as it might seem and
Arctic's pictorial guides cannot be bettered! As you'll need lots of room to manoeuvre, the weather forecast is good over the next week for working outside.
Let me know when you've done that and you never know, you might discover something simple like a broken wire.
But if everything is intact we'll get started on some electrical measurements.
Simon