The answer is in 'Dispatches & Letters' Vol 2 - p. 459. Sir William Parker was not just a signatory, but actually drew up the document in the first place:
Quote:
AGREEMENT OF THE ADMIRALS SERVING UNDER THE EARL OF ST. VINCENT, TO INSTITUTE LEGAL PROCEEDINGS FOR, THE RECOVERY OF PRIZE AND FREIGHT MONEY.
[Original, in the Nelson Papers. This Paper was drawn up by Rear-Admiral Sir William Parker, but it appears that Nelson raised many objections to the proposition.]
October and 13th December, 1797.
We, the undersigned, Sir Charles Thompson, Vice-Admiral of the Blue, the Honourable Vice-Admiral William Waldegrave, Rear-Admirals Sir William Parker, Sir Horatio Nelson, serving in the Fleet, under the command of the Right Honourable the Earl St. Vincent, conceiving, and having no doubt (except the Table-money allowed to the Commander- in-Chief) that all the emoluments—viz, Prize-money and Freight-money, belonging or appertaining to the Admiral or Flag-Officer in a Fleet, where there is only one, must and does by right belong to the Flag-Officers jointly, in a Fleet where there are many, to be divided in proportions, agreeable to his Majesty's Order in Council for the distribution of Prize-money. And as it has been customary to divide Freight-money in this manner, in Fleets where there are more Flag-Officers than one, and been invariably practised in every instance as far back as the highest Officer upon the Naval List, the Earl St. Vincent, notwithstanding, arrogates to himself a right to the whole of the Flag-Officers' share of the Freight-money, as Commander-in-Chief, and retains the same to his own use.
We, the undersigned, do hereby engage and bind ourselves respectively, to have recourse to the Laws of our Country, to obtain that justice we are not likely to obtain otherwise; and as the times of our coming under the said Earl St. Vincent's command has happened at different periods, the proportion of Freight-money due to each of us respectively, of course, is different also; the said Parties do therefore hereby further agree that each and every one shall, immediately upon signing their names to this agreement, deposit the sum of one hundred pounds, and so on, more if requisite, in equal proportions, afterwards, to carry on the Law-suit: but that in the end, upon obtaining a Decree, each Party's expense shall be proportioned according to the sum each respectively recovers— viz., if from the difference of time either party recovers a sum double to that which either of the others recover, that person is to stand at double the expense of the other, and so on, in a like proportion with respect to each other, agreeably to the sums respectively recovered.
To which we hereunto set our Hands and Seals, at the times, and in the presence, as against our names expressed.
[Added in Nelson's handwriting.]
Lord Howe, paid.
Hood, paid, but not certain as to right .
Duncan, ditto ditto.
Hotham, paid.
Harvey, paid.
[In Nelson's Autograph.]
December 13th.—From inquiry, have my doubts.
I think the opinion of three Lawyers should be taken as to our right to share in Freights, if any can be found supposed capable of judging for us, before we embark ourselves in a Law-suit which they are to determine. I recommend asking Admirals Lord Howe, Barrington, Hood, Hotham, Duncan, &c., how they have acted, before we involve in Law. Lord St . Vincent, on being informed of their opinion, will no doubt act accordingly.
Berckman was evidently wrong to say that it never came to anything. A joint action was not necessary. All that was needed was a test case to establish the principle, and then St Vincent would be hard pressed to deny the others' claims. The £5 that Parker won represented a quarter of the junior admirals' share, and presumably the other three were Thompson, Waldegrave and Nelson. It is not recorded in the account of the case, but I think the freight was carried by Mansfield in the Andromache probably around July 1797.
Whether the other three forked out their share of the legal costs is another matter. You may be right that Parker went ahead on his own in the end. Nelson and Sir William Parker were not on the best of terms at the time, with Parker having complained that Nelson had not acknowledged the Prince George's part in the capture of the San Josef at St Vincent, and I think relations only got worse when Nelson was given his independent command in the Mediterranean the following year. It is perhaps surprising that they were able to agree anything in October 1797!