The Memos and Articles usually prohibit anyone voting who owes money to the Management Company. At times it is not strictly applied but can be used when dealing with awkward individuals
As far as I know, Company Law also removes voting rights for debtors. It was specifically mentioned in an ODCE handbook for management companies (which I can't find right now).
Where a management company has adopted regulation 66 of Part I of Table
A or regulation 23 of Table C then—
“No member shall be entitled to vote at any general meeting unless all
moneys immediately payable by him to the company have been paid.”