The sprint event based from the Meres Leisure centre in Grantham consisted of a 400-metre pool swim, 16.5km cycle route out of the town and through the undulating Lincolnshire countryside returning to the leisure centre to start a two lap 5km run.
On a very cold morning Burton, who had recently returned from the club’s first ever training camp in Mallorca, finished in a time of 1 hour 21 minutes.
After the event she said: “Despite feeling rough and a bit knackered this week after last week’s exertions in Mallorca I finished third in my age group.
“I am disappointed with that, but I did smash my 400m swim personal best, so something paid off last week. I would recommend the event for next year if anyone fancies it.”