Prime Minister Boris Johnson has promised the UK will leave the EU on October 31 (Danny Lawson/PA)

The Government has spent tens of thousands of pounds in recent days on adverts promising “Brexit is happening” on October 31, despite increasing uncertainty over whether it actually will.

Figures from Facebook showed the Government had laid out £30,531 on the targeted posts in the five days since they were launched on September 4 – the same week MPs voted to block a no-deal departure.

The adverts point to information for businesses and members of the public on how to prepare for the planned exit on Halloween.

The campaign has also been featured on other social networks and on posters and billboards around the country since the start of September, as part of a promotional effort reported to be costing the taxpayer around £100 million.

Expand Close An example of the adverts being promoted on Facebook by the Government (Gov.uk/Facebook) / Facebook

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Whatsapp An example of the adverts being promoted on Facebook by the Government (Gov.uk/Facebook)

Figures for the spending on those formats are not publicly available, meaning the total amount spent is already likely to be far higher than £30,000.

Facebook began releasing data on ad spending last year, following criticism for how it shared personal data with advertisers and political groups, including Cambridge Analytica.

Expand Close Billboards are appearing across the UK urging people to get ready for Brexit (Gov.uk/PA) / Facebook

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Whatsapp Billboards are appearing across the UK urging people to get ready for Brexit (Gov.uk/PA)

The platform allows advertisers to pay to target users based on information they have shared on the site, including age, gender, location and interests.

Facebook data also shows that the Brexit Party and the Conservatives have spent the most on their main pages over the past 30 days.

A combined £48,113 was spent on adverts on the Brexit Party and Nigel Farage pages over the period.

The messages included calls for a no-deal exit and, more recently, an offer of an electoral pact with Boris Johnson if he guaranteed a “clean-break Brexit”.

Expand Close An advert promoted by the Brexit Party (Brexit Party/Facebook) / Facebook

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Whatsapp An advert promoted by the Brexit Party (Brexit Party/Facebook)

Meanwhile, the Tories continued to spend on adverts promising that the UK would leave on October 31, with a combined £28,100 spent on campaigns on the Conservatives and Boris Johnson pages during the 30-day period.

Labour were the next biggest spenders, with £24,584 spent on the Jeremy Corbyn and Labour Party pages.

The messaging appeared to be more mixed – including adverts on fracking, fox hunting and workers’ pay – however, many focused on no-deal Brexit and Boris Johnson’s plans to prorogue Parliament.

The Liberal Democrats came close behind, spending £24,271 on adverts on their main page, largely focused on stopping Brexit.

PA