Leaseholder neighbour has breached terms of his tenancy; who to enforce?

[SharedOwnrshpLeaseholdr]

My upstair's neighbour's lease requires him to provide "carpets, or such other suitable floor coverings" and also has a "nuisance" clause. He has had his flat tiled. I am now being driven nuts by noise from above: something as innocent as a chair being moved is torturing me, and so far as I can see, the tenant is just living his life.

Both parties are leaseholders with a shared ownership housing association being the freeholder. There is also the added complication that the owner has sublet the flat, and there's a tenant in there. Every movement results in impact noise transmission, and I'm going round the bend.

Does anyone know how I can get the terms of my neighbour's lease enforced? Legally, who, or what, can compel my tenant to remove the tiles again?

Any insights would be truly welcomed!

[ram]

you complain to the housing association, that upstairs is in breach of the lease, and you look forward to them enforcing the lease , which they a legally required to do ( incude the legaly bit ) and please advise when this incumberance will cease.

This post should be in the leasehold section