PROLINE-UK Company performance As a result of our forward-thinking attitude and our commitment to total customer satisfaction PROLINE-UK has become one of the leading Brands in the industry. Over the last three years the company quadrupled the size of its customer base and as a result saw its sales grew up by 300 per cent in the same period. With a lot of attention to further service improvements and re-investment in future development, PROLINE-UK expects to maintain a similar level of growth for the next three years.