From Yahoo News (via Radio Free America):

Prime Minister Tony Blair warned that Europe faced serious questions over its future after France rejected a new EU constitution, and said Britain would only hold a referendum if there was still a treaty to ratify.

Blair, on holiday in Italy, called for a period of reflection over the fate of the landmark document in order not to to pre-empt a Dutch referendum, set for Wednesday, or a quarterly summit by EU leaders in mid-June...

While emphasising that he hoped the Netherlands would support the text, he said the real issue was the underlying anxiety that people had about Europe's economic potential.

"Underneath all this there is a more profound question, which is about the future of Europe and, in particular, the future of the European economy and how we deal with the modern questions of globalisation and technological change."...
In April last year, Blair pledged to put the EU constitution to the unwaveringly eurosceptic British electorate, despite opinion polls showing that a large majority oppose it.

After France's 'Non' and ahead of the next referendum in the Netherlands, however, the British leader was more cautious about a vote at home.

"If there is a constitutional treaty to vote upon we will have a vote in Britain before ratifying it," he told reporters.