The Queen desired me to write to you yesterday in returning the private letters you sent her with reference to what you said in one of your letters of the probable designs of France in Belgium. Her Majesty wished me to inform you that she had more than once called the attention of the late Government to this subject. The King of the Belgians in writing to her had repeatedly expressed his apprehensions that either by means of a Customs convention or by the purchase by a French company of the Luxemburg Railway to which unusual privileges and advantages would be conceded by the French Government, France might seek to obtain a footing in Belgium highly dangerous to her future independence and neutrality. Her Majesty, though hoping the King might exaggerate the danger, has invariably expressed the strongest opinion that England was bound, not only by the obligations of treaties, but by interests of vital importance to herself, to maintain the integrity and independence as well as the neutrality of Belgium; and that the best security for these essential objects would be found in the knowledge that any proceedings which seemed to threaten their violation would bring England at once into the field.

Her Majesty did not mean that any official communication should be made on the subject, but that the habitual language of our ministers at Berlin and Paris should be such as to leave no doubt as to the determination of England.

Lord Lyons: A Record of British Diplomacy — Part 142

This communication from the Queen was followed not long afterwards by a memorandum from Mr. Gladstone, laying stress upon the fact that the 'independence of Belgium was an object of the first interest to the mind of the British People,' and hoping that it would be made clear to the French Government 'that the suspicion even of an intention on the part of France to pay less respect to the independence of Belgium than to the independence of England would at once produce a temper in the country which would put an end to the good understanding and useful and harmonious co-operation of the two Governments.' This was very clear language--especially for Mr. Gladstone--and the Ambassador was directed to hint to the French Government that Belgium was under our special protection.

Lord Lyons: A Record of British Diplomacy — Part 142