The mum of five was in action last weekend in England at the British Masters in Sheffield where she clocked in at 11:01.55, with her time in the 3000m track run earning her the global best in indoor category.
The Falkirk Victoria Harriers athlete recently also landed a world best in her age group for 5k on the roads to add to a European 10,000m track record set last year.
She’s now went on to beat that time by nearly five seconds after a superb showing in Glasgow at the weekend.
Her time was 10:56.89 and was one of two world records set at the 4J Scottish Masters 3000m Championships.
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Speaking to the Herald, the 60-year-old was happy to have beaten the record again after not being even sure she would compete at the event.
She said: “It was brilliant to be back home as such being in Glasgow.
"That’s been a few years now due to Covid-19 and it was great to see so many officials and people that I knew.
"I wasn’t even sure I would be able to take part just to due to my recent injury problems but I felt good on the day.”
After breaking the world record last weekend, Fiona approached the event in Glasgow with a mindset of just going out to enjoy herself.
She admitted she had no expectations of beating her time.
"I’m going to go out there and enjoy it I said beforehand,” she recalled.
"I felt really relaxed this time because it was in Glasgow at a place I really enjoy running.
"I decided I wasn’t going to look at the time until the last couple of seconds so I could just have fun.”
With her husband and close friends watching on, the local legend realised late on beating her world record was on.
"It’s on it’s on was a shout I had heard from the crowd,” she said.
"Once I knew there was a chance I made sure I gave everything to try and beat it.
"I was delighted when I went over the line.
"Just like last weekend I had no expectations.”
Fiona is now looking forward to a cross country 1500m event, which she says will be something different to the norm.
She said: “The social aspect of the event is lovely and I’m looking forward to it.”