Britain’s Electoral Commission opened a four-week bidding process for those seeking to run the “Remain” and “Leave” campaigns for the June 23 referendum on European Union membership.

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Groups have until March 31 to apply, the commission said in an e-mailed statement Friday. The commission has to announce which organization will represent each side by April 14. Groups gaining the designation are granted the right to free distribution of campaign material, broadcast time and the freedom to spend as much as 7 million pounds ($10 million) on campaigning.

The Britain Stronger In Europe movement, headed by former Marks & Spencer Plc Chairman Stuart Rose, is bidding to represent the “Remain” side. Those campaigning to quit the EU are split between Vote Leave on the one hand and Leave.EU, with the associated Grassroots Out movement.

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