Crystal Reports Is Statement help

Message

     Hi Guys 

I am attempting to construct an if statement that will enable me to count all jobs between certain central London postcodes. The statement i have written is: 

Global NumberVar EC1EC1 := EC1EC1+
(If ((Left({TableA.adad_postalcode},3) ="EC1") and {TableA.adad_addressnumber} = 0 )
and 
    ((Left({TableA.adad_postalcode},3) ="EC2") and {TableA.adad_addressnumber} =1)

      then 1 
             else 0);

If i only use the first line of the if statement it works fine. If i run 
both lines then my result is 0 . I have a feeling that my brackets may not be right but i am not so sure. 

 The numbers means 1=collection 0= delivery. 

I need to work out all collections from ec1 to ec1
                                                            ec1 to ec2 
                                                            ec1 to ec3 etc. 

EC1/2/3 are London postcode. 

Any help would be appreciated. 