Green lines on screen curiosity

[Bonney85]

Hi all,

I recently purchased an Xperia 5V and have had a few comments to look out for green lines down the screen... Is this issue a known heat related issue? (as I live in the UK and it's not overly hot here). Has anyone in the UK expected the green lines of death? and lastly, has anyone been unfortunate enough to have had them occur on a 5V yet? 

Many thanks