In all, three MEPs and several high-ranking members have resigned in just over two months over the direction the party has taken under Batten — and the apparently impending arrival of Robinson to the party could precipitate yet further exits.
Batten nonetheless appeared at several 'Free Tommy' protests — including an event at which he dubbed the prophet Muhammad a "paedophile" — after Robinson was jailed for contempt of court earlier this year.
Despite the evidently fractious controversy surrounding his party management, on December 2 Batten survived a no confidence vote launched by supporters of former chief Nigel Farage — the result led to the resignation of Suzanne Evans, former party deputy chair.
She said she was increasingly alarmed by the "perverse direction" Batten was dragging UKIP, and saw the vote as the party's last hope, accusing the party's NEC and MEPs of ignoring "obvious attempts by Gerard and Robinson to orchestrate a Momentum-style takeover".
"I'd never have joined Ukip as it stands today, obsessed as it is with becoming a successor to the British National Party and the English Defence League, and putting an increasingly hostile and vicious focus on attacking the Muslim community en masse," she said.
Bill Etheridge MEP, who quit the party October 2, told The Independent he feared Batten was merely a 'placeholder' for Robinson.
"The fact Robinson has been taken on as an adviser without even being a member would suggest he is going to have a senior role. I think Batten might be keeping the seat warm. By calling people to rally round his very strong and extreme views on certain matters, he will have a strong membership, but he'll also frighten off the general public who might've been inclined towards Ukip in the past. UKIP should be on at least 15 percent in the opinion polls and it's not, because his views are making the party so marginal that normal voters just don't want to touch it," he said.
Nonetheless, he acknowledged Batten had saved UKIP from financial ruin — even if temporarily — and membership had increased significantly under his tenure. Still, such apparent successes weren't sufficient for the defector.
Other figures to quit the party over Batten's leadership include Patrick O'Flynn MEP, who specifically cited the arrival of Robinson to the UKIP scene as his reason for quitting, and hereditary peer William Dartmouth MEP, who left in September.