HELP! I have 7 partitions, 2 EFI, 2 MacHD, etc.

I have no idea how this happened, but my internal HD has ended up with 7 (yes, seven) partitions, 6 of which are invisible, and several of which are duplicates. Neat trick, I know, and no, no clue how!

Specs: iMac 27" Late 2012, running Mavericks 10.9.5. Have tried rebooting into Time Machine (external drive), a CarbonCopy Clone (other external drive) and Recovery Mode, none of these will allow me to re-partition the drive. Here is what Disk Utility shows (with hidden volumes enabled):

When I run diskutil list, the drives appear as follows:

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_CoreStorage 121.0 GB disk0s2

3: Apple_Boot Boot OS X 134.2 MB disk0s3

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage 999.3 GB disk1s2

3: Apple_Boot Recovery HD 650.0 MB disk1s3

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Manor *1.1 TB disk2

This all started when trying to set up BootCamp, which also threw up a list of 7 volumes, none of which could be used to install Windows.

I am pretty much out of ideas...... Help?