Hampden lost the case - Rex v. Hampden, (3 State Trials, 825) by a vote of 7-5 in the Exchequer Chamber - but the closeness of the result, and the fact that Hampden was prepared to be taken to court for non-payment - encoraged many others to refuse. It was also the subject of many partisan pamphlets prior to the outbreak of the civil war. [If you have acess (possibly through a university library to JSTOR - you can read an article about the use of the case at the time here)]
The English have rightly regarded this case as an important part of the struggle which ultimately led to the Sovereignty of Parliament.
Further information on Parliament and control of taxes can be found here.