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The legal grey area around his status at birth meant Mr Smith was vulnerable to the Home Office's "hostile environment" immigration policies introduced in 2012.

Dad Oli Harrison said he would "never intervene" in another person's parenting methods, but added that a ban would "probably be beneficial" to avoid it being seen as a "grey area".

“Oscar night in black & white, no grey area,” the “Coming 2 America” actor wrote on Instagram, including three photos and seemingly indicating her couplehood with the British performer beyond a doubt.

Despite the FDA’s decision in December, retailers can still operate openly, albeit in a slightly grey area of the law.

"My argument would be that fingerprinting sits in a little bit of a grey area," says Pete Wallace, from advertising technology company GumGum.