I can't understand what additional investigating needs to take place as its in black and white at Companies House.
The difficulty is discerning whether these joint ventures constitute extra income (now or delayed) to the players involved and that is somehow linked to the club.
Well, my view is that if such investments are only available to Sarries players then they break the spirit of the cap at least and certainly could be construed as extra income at worst.
My view lines up with "Investopedia" which notes
Investment Income and Taxes
While it is not always the case, the majority of investment income is subject to a preferred level of taxation once the funds are withdrawn. The associated tax rate is based on the form of investment producing the income and other aspects of an individual taxpayer’s situation.
So any growth in such an investment or if the investment is subject to withdrawal - then that is "income" just not salary income - its investment income and subject to tax and as such, for me, as only available to Sarries players, should be deemed part of the cap on the money receivable by players.
The agreement may not cover all forms of income - but if the investments are - as it seems - designed to get money to players (Sarries only) in a way not covered by agreements - it doesn't have much merit and may explain how such a proportion of the last Lions team can be afforded?