Q.Are The Plants Shown In Photo An Evergreen Clematis Or An Invasive Non Flowering Plant.
Climber against a south facing fence. Leaves are 10cm long by 4cm wide (average), longest is 13cm long

Certified GKH Gardening Expert
It does look like an evergreen clematis. They normally bloom in spring. Are you saying yours doesn't bloom? Here are some care tips that should help:
https://www.gardeningknowhow.com/ornamental/vines/clematis/types-of-clematis-plants.htm
https://www.gardeningknowhow.com/ornamental/vines/clematis/getting-clematis-to-flower.htm
https://www.gardeningknowhow.com/ornamental/vines/clematis/growing-evergreen-clematis-vines.htm