Wrekin MP Mark Pritchard denies claims over his conduct at Westminster

Mr Pritchard, Conservative MP for The Wrekin, is one of three MPs accused of using threatening and intimidating behaviour towards parliamentary clerks.

Paul Farrelly, the Labour MP for Newcastle-under-Lyme, and Speaker John Bercow were also named in the investigation by the BBC Newsnight programme.

But Mr Pritchard said there was no truth in the claims whatsoever, saying that he never used foul language and had never had a complaint levelled against him.

Mr Pritchard said: "I understand, over the past several years the House authorities have addressed numerous complaints about MPs, but they have also informed me they have no record of any complaints against me, and if they had, I would have been notified."

He added: “I refute this story completely. I have never sworn at any clerk in all of my 13 years in Parliament and the House has never received any such complaint. This story is based upon anonymous and secondhand hearsay from ten years ago. It is hurtful and completely false”.

The Newsnight investigation, by BBC journalists Chris Cook and Lucinda Day, claimed Mr Pritchard used foul language in an exchange with a clerk and was known for having a bad temper.

The investigation also included allegations that Mr Farrelly continually belittled and undermined a particular clerk in front of her MPs and her own staff.

Mr Farrelly told Newsnight: "In 2012 allegations were made about me having bullied a clerk to the Committee during the compilation of the phone hacking report.

"These allegations were investigated and not upheld.

"Despite this, I apologised if I had inadvertently upset the clerk who had suffered stress."

Speaker John Bercow was also accused of bullying his former private secretary, shouting at her and undermining her in front of staff.

The Speaker's spokesman said: "The Speaker completely and utterly refutes the allegation that he behaved in such a manner, either eight years ago, or at any other time. Any suggestion to the contrary is simply untrue."

A House of Commons spokesman said: "We take the welfare of our staff extremely seriously, and strongly reject any claims to the contrary.

"It is a grotesque exaggeration to suggest that members of the House of Commons service work in a 'culture of fear' in relation to dealing with bullying and harassment by MPs.

"The House of Commons takes pride in being a responsible and supportive employer and does not tolerate bullying or harassment of any kind.

"In 2014 the House of Commons introduced the revised Respect policy which is specifically designed to combat bullying and harassment of House employees by MPs or their staff.

"In addition, we have implemented a range of measures to complement the Respect policy, including training for managers on how to address reports of bullying or harassment and a team of trained bullying and harassment contacts for staff to approach should they have concerns.

"We are unable to comment on any individual cases but note that the issues raised by BBC Newsnight precede the introduction of these new procedures and processes."