Recycled Ocean Plastics

Hi - I work with an independent drinks brand and we are looking at how we can improve our manufacturing processes and offering on an environmental level. An issue that the client is passionate about is ocean plastics and they are keen to create products (part) made from recycled ocean plastics. These would be multi-use not single use products.

Looking into this it is hard to find a supplier for recycled ocean plastics in the UK and it isn't really our area of expertise. Does anyone have guidance or sign post us towards manufacturers that use recycled ocean plastics (the product in mind is plastic glasses/cups) 

Many Thanks