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There's a printing company here in the states. I am sure they ship to UK. Uprinting.

This is a pole banner that might work. https://www.uprinting.com/pole-banners.html

They print just about...

Inkjet Plotters can print around 3-4' wide paper on rolls. The quality is excellent depending on the paper stock.

For years I had a friend print my stereograms for gallery shows 16" x 20". He...