Campervan Tim
It depends on several things aside from what is in the lease.
If the conversion was relatively recent then it may have had a planning condition related to noise separation measures which may or may not include the floor covering. Ditto with Building Regs. Some separating floor constructions between flats rely on the soft covering and/ or its underlay to deal with impact sound. Not sure what yourneighbours have in terms of wooden flooring but wood strip flooring can also contribute to the sound resistance of the floor if it has a suitable resilient layer under it.