The government appears poised to avoid a defeat over plans to relax Sunday trading laws after striking a deal with the SNP, the BBC understands.
SNP MPs are set to abstain in the vote if certain safeguards are put in place.
This would counter a sizeable rebellion expected by Conservative MPs, who have reservations about the proposed plans.
Ministers have until 17:00 GMT to table amendments to the Enterprise Bill, which will be debated in the Commons on Tuesday and Wednesday.
The government wants to allow local councils in England and Wales to decide whether larger stores should be able to stay open longer than the current six hours on a Sunday.
Ministers say the move – first announced by Chancellor George Osborne in his July 2015 Budget, with a consultation that followed – would benefit "struggling high streets".
But opponents question if this would actually be the case, pointing out that under the existing law, smaller traders are allowed to open for longer.
It is understood the SNP will not block the measures provided higher Sunday pay rates in Scotland are protected and other safeguards for employees are introduced.
The party had initially said it would vote against the changes amid fears it could drive down Scottish workers' wages.
A source said: "We may now abstain if we're confident our concerns have been met."
Conservative rebels say they believe they could still defeat the measure without SNP support, but it would require more than 40 Tory MPs to vote against the government.
It is thought the government may also seek to amend the legislation to limit the extension of Sunday trading to "tourist zones", which would address the concerns of a sizeable number of potential Conservative rebels.
BBC assistant political editor Norman Smith said the prospect of the SNP co-operating with the government would inevitably be seized on by Labour ahead of the upcoming Scottish elections in May.
In England and Wales, small shops – up to 280 sq m, or 3,000 sq ft in size – can open when they want to but on Sundays, larger stores are restricted to six hours between 10:00 and 18:00. Retailers can be fined up to £50,000 if they break the rules.
There are no trading restrictions in Scotland, while in Northern Ireland shops can open for up to five hours between 13:00 and 18:00.