Q.Should I Use Weed Barrier Or Not
I have recently installed a border in my front garden, 9″ or so deep, with concrete edging, the rest is gravel. I am planting plants to supress weeds and also keep cats away. I have put down weed barrier mat, but now not sure if I have done the right thing.

Certified GKH Gardening Expert
They are helpful in suppressing weeds. Some weeds will just grow on top of the barrier. These articles should help:
https://www.gardeningknowhow.com/plant-problems/weeds/controlling-gravel-weeds.htm
https://www.gardeningknowhow.com/plant-problems/weeds/weed-barriers-in-gardens.htm
https://www.gardeningknowhow.com/plant-problems/pests/animals/cat-repellent.htm