Ok I've got this now:

Test1:

Heading1,Heading2,Heading3,Heading4 
RecordA,RecordB,RecordC,RecordD
RecordE,RecordF,RecordG,RecordH
Ed says:
Test2:Heading5,Heading6,Heading7,Heading8 
RecordC,DataB,DataC,DataD
DataE,DataF,DataG,DataH
Ed says:
Test2

Heading5,Heading6,Heading7,Heading8 
RecordC,DataB,DataC,DataD
DataE,DataF,DataG,DataH
Ed says:
So that should have at least given me 2 lines in the CSV, the list of the headers and then the first line of data cause H3 and H5 match