I've got 2 Spiral metal ducting tubes left over from an MVHR installation.
It's rigid galvanized steel tube commonly used in MVHR systems, HVAC and dust collection (e.g. in a wood working workshop).
Reasonably decent condition, has been around building work so a bit dusty!
1) 143cm Long – 200mm Diameter
2) 210cm Long – 200mm Diameter
Collection only, if you want one, let me know which one, or you're welcome to both. If they're of interest, please let me know when you could collect.
Thanks, Stuart

2 Metal Spiral Tube Ducts 200mm Diameter, 143cm & 210cm (Queen Edith's Ward CB2)