I previously had a cat until a few years ago but she was a house cat and never went out into the garden, so she only had a tray.

This time around I would like to get a cat that is used to a garden. If I have a cat flap installed, do cats just pop out when they need the toilet and if so, how do you train a cat to go outside? Do I need to have a litter tray inside as well, or even outside for that matter?

The cats I am looking to re-home all would prefer a garden (according the the Celia Hammond worker I spoke to) so I am trying to get as much info as I can before I get a cat again.

TIA