The despatch from Loo found Somers at a distance from all his political friends, and almost incapacitated by infirmities and by remedies from attending to serious business, his delicate frame worn out by the labours and vigils of many months, his head aching and giddy with the first draughts from the chalybeate spring. He roused himself, however, and promptly communicated by writing with Shrewsbury and Orford. Montague and Vernon came down to Tunbridge Wells, and conferred fully with him. The opinion of the leading Whig statesmen was communicated to the King in a letter which was not many months later placed on the records of Parliament. These statesmen entirely agreed with William in wishing to see the question of the Spanish succession speedily and peaceably settled. They apprehended that, if Charles should die leaving that question unsettled, the immense power of the French King and the geographical situation of his dominions would enable him to take immediate possession of the most important parts of the great inheritance. Whether he was likely to venture on so bold a course, and whether, if he did venture on it, any continental government would have the means and the spirit to withstand him, were questions as to which the English ministers, with unfeigned deference, submitted their opinion to that of their master, whose knowledge of the interests and tempers of all the courts of Europe was unrivalled. But there was one important point which must not be left out of consideration, and about which his servants might perhaps be better informed than himself, the temper of their own country. It was, the Chancellor wrote, their duty to tell His Majesty that the recent elections had indicated the public feeling in a manner which had not been expected, but which could not be mistaken. The spirit which had borne the nation up through nine years of exertions and sacrifices seemed to be dead. The people were sick of taxes; they hated the thought of war. As it would, in such circumstances, be no easy matter to form a coalition capable of resisting the pretensions of France, it was most desirable that she should be induced to withdraw those pretensions; and it was not to be expected that she would withdraw them without securing for herself a large compensation. The principle of the Treaty of Loo, therefore, the English Ministers cordially approved. But whether the articles of that treaty were or were not too favourable to the House of Bourbon, and whether the House of Bourbon was likely faithfully to observe them, were questions about which Somers delicately hinted that he and his colleagues felt some misgivings. They had their fears that Lewis might be playing false. They had their fears also that, possessed of Sicily, he would be master of the trade of the Levant; and that, possessed of Guipuscoa, he would be able at any moment to push an army into the heart of Castile. But they had been reassured by the thought that their Sovereign thoroughly understood this department of politics, that he had fully considered all these things, that he had neglected no precaution, and that the concessions which he had made to France were the smallest which could have averted the calamities impending over Christendom. It was added that the service which His Majesty had rendered to the House of Bavaria gave him a right to ask for some return. Would it be too much to expect, from the gratitude of the prince who was soon to be a great king, some relaxation of the rigorous system which excluded the English trade from the Spanish colonies? Such a relaxation would greatly endear His Majesty to his subjects.
With these suggestions the Chancellor sent off the powers which the King wanted. They were drawn up by Vernon with his own hand, and sealed in such a manner that no subordinate officer was let into the secret. Blanks were left, as the King had directed, for the names of two Commissioners. But Somers gently hinted that it would be proper to fill those blanks with the names of persons who were English by naturalisation, if not by birth, and who would therefore be responsible to Parliament.
The King now had what he wanted from England. The peculiarity of the Batavian polity threw some difficulties in his way; but every difficulty gelded to his authority and to the dexterous management of Heinsius. And in truth the treaty could not but be favourably regarded by the States General; for it had been carefully framed with the especial object of preventing France from obtaining any accession of territory, or influence on the side of the Netherlands; and Dutchmen, who remembered the terrible year when the camp of Lewis had been pitched between Utrecht and Amsterdam, were delighted to find that he was not to add to his dominions a single fortress in their neighbourhood, and were quite willing to buy him off with whole provinces under the Pyrenees and the Apennines. The sanction both of the federal and of the provincial governments was given with ease and expedition; and in the evening of the fourth of September 1698, the treaty was signed. As to the blanks in the English powers, William had attended to his Chancellor's suggestion, and had inserted the names of Sir Joseph Williamson, minister at the Hague, a born Englishman, and of Portland, a naturalised Englishman. The Grand Pensionary and seven other Commissioners signed on behalf of the United Provinces. Tallard alone signed for France. He seems to have been extravagantly elated by what seemed to be the happy issue of the negotiation in which he had borne so great a part, and in his next despatch to Lewis boasted of the new treaty as destined to be the most famous that had been made during many centuries.