Hi P, there is a known bug in the 1803 version of Windows 10. Microsoft are aware of this issue and hopefully are working on a patch . . .
Right click your Start Button, choose Powershell (admin)
Run this command and hit Enter
$1 = New-WinUserLanguageList en-GB
Run this command and hit Enter
Set-WinUserLanguageList $1
Close Powershell and restart your PC