A chief constable has defended his force's handling of child sex allegations against former prime minister Sir Edward Heath.

Mike Veale, who leads Wiltshire Police, wrote an open letter to the public to "set the record straight" about the investigation.

Police vowed to continue their investigation into allegations of child sex abuse by the late Sir Edward in May after several people responded to an appeal for information.

Wiltshire Police was itself under investigation for possible misconduct over claims that it shelved a prosecution over threats to identify the former Prime Minister.

But the Independent Police Complaints Commission (IPCC) found no evidence of wrongdoing and concluded that the trial in question was stopped because witnesses refused to testify.

The IPCC investigated claims by a retired senior officer that Wiltshire Police deliberately caused a criminal prosecution to fail in 1994 after the defendant – a brothel owner - threatened to tell the press she supplied Sir Edward with underage boys for sex if the trial went ahead.

In the public letter released on Friday, Mr Veale said: "When I took on this investigation I knew it would attract intense scrutiny. I also recognised it could potentially damage confidence in Wiltshire Police."

He described the former Conservative prime minister, who died at home in Salisbury in July 2005 aged 89, as an "extremely prominent, influential and high profile person".

"The decision to undertake this incredibly complex and challenging investigation was not taken lightly particularly knowing, or at least expecting, that we would be placed under intense scrutiny," he said.

The police probe, named Operation Conifer, began in 2015 after claims against Sir Edward surfaced.

Mr Veale said: "Over the last few weeks particularly, there has been much speculation about this case.

"Whilst it is not commonplace for us to comment on a live ongoing criminal investigation I really am very concerned and profoundly disappointed about the impact of this speculation on the public's confidence in the police, the potential prejudicial impact upon a live criminal investigation, not to mention the confidence of persons who have come forward with information."

Edward Heath - Life in pictures Show all 15 1 /15 Edward Heath - Life in pictures Edward Heath - Life in pictures Edward Heath Leader of the British Conservative Party Edward Heath tours his constituency during the general election campaign, 1966 Edward Heath - Life in pictures Edward Heath British Conservative Party politician and amateur musician, Edward Heath conducting the annual carol concert at the Grand Ballroom, Broadstairs, Kent, in December 1963 Edward Heath - Life in pictures Edward Heath Conservative Party leader Mr Edward Heath holds up with pride the new Conservative election manifesto entitled 'A Better Tomorrow' at a press conference in London, 1970 Edward Heath - Life in pictures Edward Heath British prime minister Edward Heath chatting with US president Richard Nixon at Chequers in Buckinghamshire Edward Heath - Life in pictures Edward Heath British Prime Minister Edward Heath, skipper of the British team for the Admiral Cup Series with his team aboard the yacht 'Morning Cloud' at Southsea, Hampshire, 1971 Edward Heath - Life in pictures Edward Heath In 1974 the Conservative Prime Minister Edward Heath, left, was ousted from Downing Street when Harold Wilson, right, formed a minority Labour government Getty Edward Heath - Life in pictures Edward Heath Ted Heath leaves Downing Street to hand in his resignation, 1974 Getty Edward Heath - Life in pictures Edward Heath British Prime Minister Edward Heath announces the date of the General Election, 1974 Edward Heath - Life in pictures Edward Heath Deposed Conservative party leader Edward Heath with his successor Margaret Thatcher, 1975 Edward Heath - Life in pictures Edward Heath Former Prime Minister Edward Heath at his home in 1975 Getty Images Edward Heath - Life in pictures Edward Heath At the Conservative Party Conference (L-R), Mr Edward Heath, MP for Bexley, Mr Francis Pym, Leader of the House of Commons, and Mr William Whitelaw, Home Secretary, applaud a colleague's speech, 1981 Edward Heath - Life in pictures Edward Heath Edward Heath at his home in Salisbury in 1980s Edward Heath - Life in pictures Edward Heath Edward Heath bids farwell to Chia Chia the panda, London Zoo, 1988 Edward Heath - Life in pictures Edward Heath British prime minister Sir Edward Heath, appearing before the US Senate armed committee on the situation in the Persian Gulf, 1990 Getty Edward Heath - Life in pictures Edward Heath Sir Edward Heath arrives at No.10 Downing Street for a dinner hosted by Prime Minister Tony Blair in London, 2002

He described the investigation as "complex and multi-stranded" but added: "This is not a 'fishing trip' or 'witch-hunt' - both of these terms have been unfairly levelled at us.

"The legal role of the police service is to, on behalf of the public, impartially investigate allegations without fear or favour, and go where the evidence takes us.

"I take my responsibilities of operational independence, which is the bedrock of British policing, very seriously indeed.

"Therefore I will remain operationally independent and will not be influenced by inappropriate and unacceptable pressure from people who don't know the detail of this case.

"I will not be buckling under pressure to not investigate or to conclude the investigation prematurely."

Mr Veale said investigators had not spoken to the man known as Nick who features in Operation Midland – the Met Police probe into an alleged Westminster paedophile ring.

Last weekend The Mail On Sunday reported the contents of a leaked confidential report into Operation Conifer, which referred to satanic ritual sex abuse.

Edward Heath 'raped 12 year-old boy at Mayfair flat'

"Let me be clear, this part of the investigation is only one small element of the overall inquiry and does not relate to Sir Edward Heath," Mr Veale said.

"It is also very important for me to reiterate that the report forms part of a live ongoing criminal investigation, so the disclosure of this information is something which we take very seriously."

Earlier this month two people were arrested and bailed by detectives working on Operation Conifer.

The Independent Police Complaints Commission launched a probe into alleged historical corruption after information from a retired officer raised concerns that Wiltshire Police deliberately caused a criminal prosecution to fail 22 years ago.

Earlier this year the probe found no evidence that a prosecution against a brothel keeper was dropped because of threats to allege publicly that Sir Edward had been involved in sexual offences.

Wiltshire's police and crime commissioner Angus Macpherson said: "The chief constable and I both take very seriously the duty to investigate fully and fairly all allegations or complaints that are received by the force.

"Once the police have conducted the investigation to a conclusion, there must be an alternative avenue to assess the credibility of any evidence that has been gathered."