How to wire electric blinds (UK)
Figure 1. (a) 3-wire circuit. (b) 2-wire circuit.


You need a 3-way (as in "positions"), 2-pole, centre-off, switch for each blind. ( Note that "3-way switch" in North America means a two-way changeover switch as used in stairs lighting.)
Figure 1a shows how to wire it with three wires assuming the end-of-travel switches are installed in the motor mechanism. As drawn, the motor will run until the open position is reached. The OPEN limit-switch will open and stop the motor. By switching SW1 the motor will run until the CLOSED switch opens upon which the motor will stop.
Figure 1b shows how to reduce wiring to 2-wire by the addition of a pair of diodes. As shown, current will flow through D1 until OPEN opens, as before. When SW3 is reversed current can flow through the CLOSED switch and D2.


We have no idea if the switches or diodes are in your blinds mechanism at this time.