The 20-year-old, who won floor bronze at Rio 2016, quit the sport after lodging a formal complaint over allegations of abuse in December 2019, only for it be dismissed last month.

Head national coach Amanda Reddin has temporarily stepped aside while an investigation is underway into claims about her conduct.

But in an open letter directed towards Allen, Tinkler claimed she had not been given an explanation over why her complaint had been dismissed and demanded answers within the next seven days.

In the open letter published on Twitter, Tinkler wrote: "It's been 271 days since I submitted my complaint and 25 days since I was abruptly told by email that my complaint into Amanda Reddin and British Gymnastics was closed.

"I've emailed British Gymnastics three times since asking for an explanation or summary outcome.

"I've received nothing. 

"Do you think this is acceptable? 

"Why is it taking so long to share information with me?

"I don't think it's acceptable.

"I feel I've given British Gymnastics plenty of time to do the right thing.

"You, as CEO, must recognise that. 

"Do you recognise that? 

"Are you proud of how I’m being treated?

"It is now obvious that your organisation acts only when a light is shone on your behaviour.

"Left to your own devices you'll ignore those who you should be supporting. 

"Why, as CEO, do you let this happen? 

"Why have you created this culture?

"I have spoken with key people that helped me whilst I was on the performance programme and none have been contacted by British Gymnastics to discuss my complaint or aid an investigation. 

"Who did you speak to when investigating my complaint? 

"Why were these key people not interviewed?"

Tinkler also claimed she had found out "via a letter to a third party" on August 10 that British Gymnastics had closed her complaint before being told by the governing body on August 24 "after pressure from the UK media".

"Why did you mislead me as to the outcome of my complaint?" Tinkler added.

"I was promised a summary outcome.

"Now you say this isn't possible due to 'employee privacy rights'.

"You have shared details of the outcome (and the respondent's version of events) when concluding other cases.

"Why are you treating me differently? 

"Are you aware your actions are prolonging my suffering?

"All I ask Jane, is for you to be honest, to be open, and to lead as a CEO should.

"Please help me. 

"Please help all of us gymnasts and stop hanging us out to dry.

"Please answer my questions in the next seven days, if you don't I'll know that you're not taking me, other gymnasts or your role as CEO seriously."

A statement from British Gymnastics read: "We apologise to Amy for any issues with our communications around her complaint.

"She deserves answers and we have offered to meet her either in person or virtually so we can talk her through the answers to her questions."

Last month, Allen admitted that British Gymnastics had "fallen short" in protecting its members following allegations of abuse from numerous high-profile athletes, including sisters Becky and Ellie Downie, Tinkler and Nile Wilson.