Hundreds of thousands of Leave.EU newsletters were sent to Banks' customers.
The multi-millionaire was a prominent campaigner for Brexit.
Questions raised over "true circumstances" of funding arrangement.
Pro-Brexit group strategist lays bare how close it was to collapsing
The ‘Vote Leave’ campaign in the EU referendum would have probably collapsed if David Cameron had pushed harder for Brussels
A prominent campaign that encouraged Brits to vote for Brexit in the EU referendum has spectacularly gatecrashed the Olympics