London - Whether he is a "plastic Brit" or a legitimate new member of "Team GB", teenage sprinter Zharnel Hughes is the latest face of one of the most contentious issues in world sport - nationality switches.
Hughes, 19, has held a British passport since his birth on the Caribbean island of Anguilla, a British overseas territory not recognised by the International Olympic Committee.
So he has become one of five athletes to switch allegiance to Britain proper.
Top of British rankings
The move might have gone generally unnoticed but for the fact that Hughes is very, very fast...the latest in an admittedly long line of sprinters to carry the burden of being described as the "next Usain Bolt".
Earlier this month he was, in fact, the next after Jamaican Bolt as he pushed the world record holder all the way to finish second over 200m in New York. His best time over the distance of 20.15 seconds has immediately put him top of the British rankings this year.
His target is to run for his new country in the 2016 Olympics.
But Hughes' arrival, while seemingly boosting Britain's medal chances, has not been universally welcomed.
World indoor champion Richard Kilty tweeted "Good for fans to see home-grown talent representing GB...oh wait" - becoming embroiled in a Twitter row on the issue.
Also "becoming British" was American sprint hurdler Cindy Ofili, who follows in the footsteps of older sister Tiffany Porter, whose switch in 2010 brought the term "plastic Brit" to the fore. They have a British parent.
Two more Americans and a Swede completed the latest switch.
Athletics of course, is far from alone when it comes to flying the Union Jack flag of convenience as the dressing rooms of England's national cricket and rugby union teams can look like more southern hemisphere than southern counties.
However, anyone thinking this is a British issue is sorely misguided. Nations the world over are plundering whatever feeder source they can to further their own ends.
New Zealand's rugby relationship with the Pacific Islands is a complicated one but the bottom line is that the All Blacks are routinely strengthened by a conveyor belt of talent from the likes of Fiji, Tonga and Samoa, whose proud sons will appear in the colours of around half the 20 teams in this year's Rugby World Cup.
For most of the islanders the switch is a straightforward financial one, just as it is for Kenya and Ethiopia's leading human export - talented endurance runners.
Three of them filled the medal places at the European cross country championships last year, with Turkey (gold and silver) and Spain basking in the reflected glory.
In recent years more than 50 top class Kenyan runners are estimated to have transferred allegiance to Qatar and Bahrain alone while France has swept up a similar number largely from north Africa.
And the United States regularly embraces athletes with new passports - think tennis great Martina Navratilova.
Each sport has different rules regarding eligibility and many of them have tightened them up after controversies.
Irish soccer enjoyed its most successful period during the late 1980s and early '90s when the national team was packed with players selected on the basis of dubious distant relations.
Those mostly English players, some of whom later confessed to have absolutely no connection, were widely welcomed, at least while the teams were winning.
And while a sportsman or woman competing in the colours of a nation is easy to recognise and identify with, things are less clear cut in sports such as motor racing.
The Union Jack might fly above the podium when Lewis Hamilton wins a Formula One race, yet he races for Mercedes and has lived in the tax havens of Switzerland and Monaco for the last eight years - so of course last year he was voted Britain's sports personality of the year.