Thanks for your enquiry.
The clause in your Lease is there to stop you from putting down any laminate/wooden flooring (it can create terrible noise issues for any occupier below your Flat). So, unless you are on the ground floor, I have to recommend that you do not proceed- if you do, and any noise problems are encountered, the Freeholder would be entitled to ask you to remove the flooring.
I hope this assists and sets out the general legal position.
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