The Communications Workers Union has delivered a giant, 20ft postcard to the London offices of the government Business Industry and Skills (BIS) department as part of the union’s protest against cuts to the Post Office.

The postcard has been taken around the UK on the side of the double decker bus, while the CWU has been collecting signatures from the public. The postcard was delivered to the BIS on Friday.

The CWU has been using social media as well, with stills images and videos of the so called Battle Bus arriving in Parliament Square.

The CWU says that the Post Office has announced the closure of 64 Crown Post Offices so far this year. It has called for a strike ballot in response to these cuts.

In a prepared statement issued on Thursday, CWU general secretary Dave Ward said: “Our Post Office is in crisis. Closures and privatisation are rife, thousands of jobs are being lost and millions of pounds of public money is being misspent by the gross mismanagement of company bosses.

“The company has been quietly but systematically closing and privatising our post offices and flogging the real estate. The government has allowed this in the face of public opposition and without any legislation or decision of parliament. The British people are being robbed of a public asset and public service by the drip-drip of closures, franchises and cuts to jobs and services.

“The post office as we know it is on the brink of extinction. We’re asking the government to act now to protect the heart of the High Street.”