Possession of the mark passed last night to Laura Muir and her predecessors would surely approve after the 21-year-old from Perthshire delivered a tenacious late burst at the Diamond League in Paris to enhance her stock further.
With the first five finishers breaking the four-minute barrier, Muir was short by just seven-hundredths of a second but it was still a massive step forward. Only five British athletes have run faster, with Laura Weightman - who edged Muir for the UK title last weekend - fractionally behind in a race won by the Netherlands' Sifan Hassan.
It sets things up nicely for Muir's next outing, at the Sainsbury's Grand Prix at Hampden on Saturday when she will face off for the first time with European champion and compatriot Lynsey Sharp.
"I showed in the indoor season at the Emirates Arena and in Birmingham that I run really well in front of a home crowd," said Muir, who is one of the Sunday Herald's Six to Follow. "It's going to be a great run-through for the Games, to see how everything works and to get a feel for the stadium. It's going to be an amazing meeting."
There was frustration for Eilish McColgan, though, after she dropped into 13th place in the 3000m steeplechase, finishing in 9:54:56, as Ethiopian Hiwot Ayalew out-paced Emma Coburn over the final lap. The UK champion has confirmed plans to see specialist help for her hurdling in her quest to narrow the gap with the event's elite.
"I've started speaking to a coach at Loughborough to look at my hurdling and that will be reinforced into next year, possibly even with trying to hurdle with both legs," said McColgan.
Meanwhile, British sprint hope Chijindu Ujah was sixth in the 100m won by Mike Rodgers of the United States.