Stairlift request by individual in a block?

We own an apartment with a share of the freehold in North London. The block has 9 flats and we are on the top floor. Over the past few weeks another owner has made a request to the block management company that they require a stairlift for easier access.

The person is quite elderly but lives with their son and has carers assisting her to go up and down the stairs. Although sympathetic with her predicament the problem is some property owners and shareholders are concerned putting in a stairlift in narrow stairs where there is no lift may create access issues and also put off other renters and may decrease the value of the entire block.

Better would be for the individual to make plans and should have already made preparations to sell the property or rent it out and move into another flat somewhere on the ground floor.

The block managers are not very active or proactive in this or on other matters. What obligations do the managing agents, the shareholders and directors have to deal with this request?

How should it be managed if the consensus was to deny the request for the reasons suggested?

MJB