Viva ignition switch problem

[DavidAH]

Hi, problem with intermittent starting ignition. With either key the car does sometimes not start, but usually does within 4 attempts. Sometimes leaving key in 3rd position, just before ignition, for a few seconds helps!

First garage changed starter motor, no effect. 2nd garage checked fault codes & couldn’t detect what problem was. 
Autoelectrician did more detailed checks, nothing obviously wrong, changed ignition barrel, as many users report this cleared it, but it’s improved it slightly, so you’re reassured it will start, but hasn’t cured it. Any advice welcomed. Many thanks.