cgt1 /form11

Would anyone know, if I plan to file a form 11 online before 12th Nov, do I still need to send in a CGT1 (offline before end of today?) I understand that 31st is the cut-off date for CGT1 form..
I am not sure if I'll need to do a form 11,... could I cause a problem by sending a CGT1 form .. then reporting same gain on a form 11?

If you are filing a Form 11 you may as well complete the CGT section. In that event then there is no requirement to file both.

Where do you send the CGT1 form. I can't easily determine what office to send it to - is it the Collector general in Limerick ?