Problem removing a partition created with OSX Lion

Hello,
I have two partitions on my MacbookPro. The first contains Lion the second SL. I am removing Lion (battery life is halfed as the OS is much more processor intensive). The SL partition boots and works fine and has the latest version of all OS files.
My goal is to remove the Lion partition (and the rescue partiton).
I have tried:
1. From the disk utility in the SL partition: Unmounting partition 1. and deleting it. It tells me that it is an error and it is unable to delete this partition.
2. From the disk utility in the SL partition: Erasing all data on the partition and formatting with the journaling option. Same error as 1.
3. Booting into the Lion rescue partition and running Disk utility from there (version 12.0). Same error as 1.
Does anyone know how I can delete this partition, delete the rescue disk partition and merge the two?
Many thanks for any and all help!
James

Yep, just install iDVD (plus sounds and jingles) and iWeb if you want it (but note that iWeb apparently won't work if you upgrade to Mountain Lion).
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