Finally got the cat flap programmed to the cats. Shoved them out through it with a combination of encouragement (Dreamies) and force (gentle shove).
How to get them back in? I’ve put Dreamies in the tunnel, but they just eat the Dreamies then reverse and go and stare hopefully at the door.
I can't shove them back through it because they do that thing where they turn to liquid and flow sideways.
Any advice? One is clearly desperate for a wee, so at least the silver lining might be she learns to go to the loo outside.