The Shadow Home Secretary has said the Police Federation needs to "seize the moment" and bring in changes.
Yvette Cooper questioned whether a speech made by the Home Secretary would make it more or less likely that reforms would go ahead in the Police Federation - or be far-reaching enough.
Theresa May told the federation's annual conference that if changes were not made of the organisation's own accord, the government "will impose change on you."
The Shadow Home Secretary also said that it was important to recognise the majority of police officers were working hard "to do a demanding job in difficult circumstances."
More top news
Marco Reus says even he doesn't know why he did not take a driving test after he was fined 540,000 euros for driving without a licence.
A ban on female soldiers fighting on the front line could be lifted in 2016, the Ministry of Defence has announced.
A woman who filmed her elderly mum's carer stealing money explained how she felt ill when she discovered the crime.