Comment # 2 on bug 1101736 from Stefan Dirsch

Could it be that LXDE overwrites the system keyboard settings? Please run in
the "broken" state:

  setxkbmap -print

and add the ouptut to this bugzilla. 

Then run YaST, set the keyboard to English(UK) as you had described above and
run the same command again and attach the output as well here.