If I follow you correctly, by saying that this joint company is owned
by separate limited companies, then whatever the shareholding is, it is
divided equally between the two separate established limited companies.
It is only shareholders that can benefit from any dividend. Directors cannot benefit nor be paid any dividend unless they happen to be shareholders also. The dividend will need to be documented, so ideally a board meeting of the directors of the joint company should be held and a resolution passed on the amount per share, and when it is to be paid. This should be minuted in writing and a record kept. The amount of the dividend is then paid to the shareholders as per the meeting.
The good thing is that the dividends will pass to the two bodies corporate intact without having to bother with tax credits.
It then forms part of the taxable profits of the two separate companies, and dividends then can be made from these profits.
Think about the dates of dividends, as for the receiving companies it can make a difference when tax is actually accounted for to HMRC.
David
Long ago, below an picture of a 4-masted sailing ship in a heavy storm was added: "A ship in a harbour is safe, but that's not what a ship is designed for"