Well, like I wrote earlier on, it's a matter of defining the words "English"or "Dutch".
In 1667, a fleet under Admiral de Ruyter sailed to London. Marines were landed at Sheerness, they burned the fortress there and next the English fleet was severely damaged. Now, half of the seamen on de Ruyter's fleet were not dutch. More than half of the marines at Sheerness were English.
Still, for some reason everybody talks about "The Dutch fleet" attacking "The English fleet".
If you add the presence at Blenheim of the dutch paid troops (which were technically part of the dutch Army) I would hardly consider this a small effort.
On this page:
http://www.spanishsuccession.nl/blenheim.html
you can find the allied OOB, in which the troops are sorted by pay. The picture with the nice colours is based on Wijn's book I mentioned above.
There's also some very interesting research by Dr. van Nimwegen on Marlborough's supply system, which was basically..dutch..
Further reading:
Het Staatse Leger, Volume III (The standardwork on the Dutch States' Army up to the WSS)
De subsistentie van het Leger, PhD thesis of Dr Olaf van Nimwegen, deals with the logistics of the WSS, (I have an English Summary for those interested)
De Republiek als Grote Mogendheid, Dr Olaf van Nimwegen (basically deals with AWS)
Met Man en Macht, dutch military history 1550-2000