Seventy-five people in Oxfordshire have been listed as members of the British National Party on a roster on the Internet.

The 12,000-strong membership list, which BNP leader Nick Griffin suspects may have been stolen by former supporters, includes addresses, contact details and some members’ jobs.

Among the 75 members across Oxfordshire are a retired accountant, a civil servant and a girl who joined the party at the age of 16.

The entry for another member, described as an activist, features a list of his hobbies, including outdoor bowls and cooking.

The information was taken down from the site where it was originally posted, but remained available on a number of websites yesterday.

Mr Griffin claimed the publication of the list — which exposes many secret supporters to the risk of dismissal from work, disciplinary action or vilification — would boost voter support.

He said the fact that listed members included church ministers, a prison officer and a number of former police officers would show people “we’re not a bunch of skinhead morons”.

Mr Griffin, who threatened legal action against those responsible, added: “It will significantly increase our votes next year, but economically and internally it’s going to be tough for a little while.”

North Wales police pledged to investigate any information breach “in the usual robust manner”.

Merseyside police revealed it had launched a probe to look into claims that a serving officer was on the list of leaked members.

Campaign group Unite Against Fascism said it was “in the public interest” to identify BNP members because of their potential to have access to sensitive information and to hold positions of influence in public services.

A statement from the group said: “The BNP are not a party like any other. It is a fascist organisation determined to use the respectable cover of public office to incite and spread racial hatred.

“The BNP has been exposed for its links to fascist groups around the world, and it has leading members and supporters who have been convicted of racist violence.”