All year Yurt classroom in the UK - viable? Woodstove required?

[oneworld]

Many thanks again Jafo and TSRalex for your extremely helpful suggestions.

How much use are they likely to get out of the canvas if the yurt is up all year round, which is their stated preference? The UK climate is notoriously damp and it would be helpful to offer a view on how frequently they might need to replace the canvas. I've heard of winter (vinyl?) coverings being used to protect the canvas and wondered what the pros and cons of this approach might be? Obviously extra initial cost and presumably covering the windows but might be worth it to extend the life of the canvas...?