Obviously there is a limit of nesting.
I tried by removing one by one till it worked.
But you may use a workaround.
Do a different kind of nesting.
First sort the cities by number.
Then you can say:
if(Code<75,new if-statement of cities with numbers below75,new if-statement of cities with numbers above75)
{
if(fbcode<75,
if(fbcode==44,"Airdrie",if(fbcode==55,"Andover",if(fbcode==56,"Arnold",if(fbcode==57,"Barrow",... ,if(fbcode==72,'Isle_of_Wight',"")))))))))))))))))))))),
if(fbcode==75,'Leeds_North_and_West',if(fbcode==76,'Letchworth',if(fbcode==77,'Lincoln',if(fbcode==78,'North_Enfield',if(fbcode==79,'North_Lakes',if(fbcode==82,'Northern_Devon',...,if(fbcode==99,'worcester','')))))))))))))))))))
)}
This way the nesting is lowered.
Joffm
And please, only attach lss exports.
lsq and lsg exports are language sensitive.
You cannot import a question into a survey with different base languages.
So first we have to guess which base language you used, and
second we have to create a new survey with this base language to import your question export.
So ease our life.