Perennial climber to cover a wooden fence

It isn't fully hardy. But nor is what I was going to suggest - Solanum laxum 'Album', or if you have more space, Solanum crispum 'Glasnevin'. I have both and they just flower and flower! Then there's hardy ones - Akebia quinata, or A. trifoliata, or maybe one of the many Loniceras? By the way, welcome to GoY! I hope you enjoy the site as much as I do.

HI TURTS WELCOME TO G O Y ,IF ITS FOR PRIVACY I HAVE A RUSSIAN VINE (MILE A MINUTE)BUT ONLY FOR MY BACK FENCE AS I WOULD NOT TRY IT NEAR ANY BUILDING OR OUT HOUSE AS IT LIVES UP TO ITS NAME.ITS EVEN COVERED MY LABURNUMAND IM FOREVER CUTTING IT BACK.MAYBE ANOTHER CLEMMIE TO MIX THE COLOURS.NO DOUBT YOULLE COME UP WITH A SOLUTION ,GOOD LUCK..SEEYA..

Turts, Simply having 'UK' in your profile is no help to anyone when you are requesting help. That aside.
Glasnevin is a form of spud with purple/blue spud flowers. It's also very open & untidy without constant pruning.
Akebia quinata will cover a lot of ground, slowly at first. Curious flowers early on. Near-zilch in the summer.
Camsis radicans needs lots of sun and heat, best against a wall rather than a fence. You will see very little for first three years. Red or yellow flowers?
How big is your clematis? Do want another? Is your fence for decoration? Or is it a screen? Visual or wind? Or both? In short you are not providing enough info for a best advice reply.

Hi Turts! I'm thinking....Parthenocissus tricuspidata - this does not flower, but will cover a fence with glossy green leaves that will turn a spectacular shade of bright red in the autumn.

If you are in the south of the country and your fence is west-facing (not east-facing), maybe a Passion Flower will grow? You can either get one with really VERY unusual flowers (there are a range of colours, but they are all very striking) or you can get one that produces edible fruit, but still looks good.

Solanum crispum 'Glasnevin' can be a beautiful plant, but it is more of a 'wall shrub' than a climber and they tend to be unruly.

What sort of Clematis have you got? If you want one that will cover a large area of fence and you are not worried about something getting REALLY big - then you could try Clematis montana. They come with either pink or white flowers and are pretty and easy to grow. (again best on west facing fence).

All of these plants are pretty cheap and you'll find them at any garden centre. Hope this helps!

Here in N Yorks, I've had Campsis radicans for 3 years. Its grown quite a bit but hasn't had any flowers. What about the Chilean glory vine, Eccremocarpus scaber?-especially the orange colour. It flowers for a long time-bunches of smallish trumpets- very attractive.

Honeysuckles (lonicera) are more prone to get aphids in sunny positions. According to where in the UK you are and how big a space you want to cover, abutilon megapotanicum flowers over a long period (there is a picture on my page). Not really a climber - more a lax scrambler - it will need tying to the trellis but will enjoy the position