Large scale panoramic canvas printing and mounting in the UK

I have been looking to have a couple of panoramic landscapes printed and mounted on canvas. They are 60x22 inches 75x24 inches. I had them provided by a company who claimed they could do it, but when the canvases arrived, the frames were twisted and the quality of the finish was very poor.

They have taken them back and said that they cannot improve on the quality so they have given me my money back.

Has anyone had canvas prints done in the UK of similar sizes and to a quality that they were happy with?

Thanks in advance.

Paul