Jules Lockett (pictured), head of LGBT network for the London Ambulance Service, revealed gender-neutral toilets and changing room signs have been defaced by workers

Ambulance bosses have hired handwriting experts to find staff who defaced signs on gender-neutral toilets and changing rooms.

The London Ambulance Service has introduced unisex toilets and changing facilities by putting up new signs on them at stations across the capital.

But bosses claim some NHS workers have been 'ripping them down' while others have 'taken a permanent marker... to make changes', reports The Times.

As part of a drive for LGBT inclusion, emergency call operators have also been told to abandon calling patients 'Sir' or 'Madam' and 'Mr' and 'Mrs'.

The revelations were made at a recent diversity conference in London attended by Jules Lockett, its head of emergency operations training and joint head of the service's LGBT network.

She told The Times: 'We did get a lot of people trying to rip the signs down, so we just printed a lot off and were just going round and sticking them back on.'

Ms Lockett added that one member of staff has been identified for leaving graffiti on the signs.

The London Ambulance Service has introduced unisex toilets and changing facilities by putting up new signs on them at stations across the capital. File image

She added: 'What people don't realise is we've had one of our directors who has collected these signs, collected the handwriting and asked for a professional analyst to compare that handwriting with the handwriting they used on their patient report forms, and we have found a person.'

A London Ambulance Service spokesman told the paper there had been a 'small number of occasions' of offensive graffiti on gender-neutral signs.

MailOnline has contacted LAS for further comment.

There has been a backlash from some feminist critics, who have slammed the use of gender-neutral changing rooms for 'trampling on women's rights' to privacy.

It comes after Northamptonshire Police was forced to abandon 'non-binary baseball caps' introduced last year for greater inclusion of transgender recruits.

The London Ambulance Service took part in a LGBT conference recently, where the revelations were made

The gender-neutral caps replaced the traditional helmet last May, but Chief Constable Nick Adderley has decided to get rid of them because they look 'scruffy' and 'do not portray the right image'.

He said of his decision: 'I want my officers to feel smart, to look smart, and confident to take policing back to the streets.

'We need to look, act and feel like the police, have pride in our uniform and in our badge.

'I'm listening and responding to the concerns of our staff and the public and there is so much more to come. It's time to start policing with purpose.'