Concerns have been raised at the impact on policing of extending the pilot badger cull.
The cost of policing the pilots in West Somerset and Gloucestershire were estimated at some £4 million – which forces will be able to recover from the Government.
A spokesman for Avon and Somerset Police said it was "too early" to assess how much the cull had cost but said the costs would not be borne by local taxpayers.
Opponents of the trials have said the costs involved, and the failure to shoot a sufficient number of badgers, showed the trials were a "waste of money".
Martin Surl, police and crime commissioner for Gloucestershire, warned extending the cull could create an "unhelpful situation".
He said: "I know we have to wait for an announcement from Defra about any plans for Gloucestershire but I have made my concerns and unease at any possible extension known to the Home Office."