Varnish suffered widely publicised heartache at the London 2012 Olympics, being disqualified from the women's team sprint with Victoria Pendleton for an illegal changeover.
And, while Pendleton had two other chances to redeem herself, doing so by winning keirin gold and individual sprint silver, Varnish was left utterly distraught.
Not only did Pendleton get a second and third chance, Varnish was the only member of the British track team that rode at London 2012 not to win a gold medal.
Reeling, Varnish was one of just three Brits to compete at the first World Cup of the season in Cali in October winning team sprint gold with Becky James and individual sprint bronze.
Varnish will ride those again in Glasgow as well as the keirin and non-Olympic 500m time trial however she does so less than impressed with the UCI and with her London 2012 pain still raw.
For the UCI amended the ruling regarding changeovers in the team sprint not long after the Games, effectively deciding in Varnish's favour albeit too late for it to change anything.
That has left Varnish feeling like a test subject on the grandest stage of them all.
"I don't think I'll ever be given the opportunity to race in that kind of velodrome ever again. I'm still going to feel upset and angry about it," said Varnish.
"The UCI have changed the rule now. You have to go over the team pursuit line to make it a full lap, whereas before there was a changeover area, so it was a bit more vague.
"That is even more frustrating, because they saw there was an issue. What happened at the Olympics is why they changed that. "The best thing I could've done was to get back and get racing. It was one of the hardest things to do, just to put it behind me.
"But going to Cali is the best thing I've done. I feel like I've come out of it quite well. Hopefully I'll get to the next Olympics and it will be a different outcome.
"And I put so much work into the team sprint and into that one lap, so now I'm quite excited about being able to put more time into the individual events.
"I'm doing everything I possibly can. It's all about keeping my options at the moment."