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Speaking ahead of the conference, Allister said there would be an "upbeat spirit", however, he will warn that unionism will not recover "unless and until" the Irish Sea border is fully removed.

"Rather than working with this injustice, accommodating it, going forward unionism needs to stand united against it."

"There's nothing shameful, it doesn't make your unionism any weaker," he added.

The Belfast East MP is expected to criticise those within unionism who have "thrived on attacking one another".

The assembly member warned fellow unionists that those who support a "very pure interpretation of unionism" are the people most likely to lose the union.