windows 8.1 - How do I encrypt a Samsung Evo 840 SSD?

I've purchased a HP Envy 15-j005ea laptop which I have upgraded to Windows 8.1 Pro. I have also removed the HDD and replaced it with a 1TB Samsung Evo 840 SSD. I now wish to encrypt the drive to protect my company's source code and my personal documents but I can't work out how to do it or if its even possible.

I gather that it is not recommended to use Truecrypt on a SSD but please correct me if I'm wrong. I also understand that the 840 Evo has built-in 256 bit AES encryption so it is recommended to use that.

The Evo has been updated to the latest EXT0BB6Q firmware and I have the latest Samsung Magician. I don't know what UEFI level I have but I do know that the machine was built in December 2013 and has the F.35 BIOS made by Insyde.

This is what I have tried:

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  Bitlocker. The latest Samsung firmware is supposedly Windows 8.1 eDrive compatible, so I followed the instructions I found in an Anandtech article. First of all it would seem the laptop has no TPM chip, so I had to allow Bitlocker to work without TPM. Once I'd done that I tried to turn Bitlocker on. Anandtech say that "If everything is eDrive compliant you won’t be asked whether or you want to encrypt all or part of the drive, after you go through the initial setup BitLocker will just be enabled. There’s no extra encryption stage (since the data is already encrypted on your SSD). If you’ve done something wrong, or some part of your system isn’t eDrive compliant, you’ll get a progress indicator and a somewhat lengthy software encryption process." Unfortunately I was asked if I want to encrypt all or part of the drive so I cancelled that.

  
  


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  Setting the ATA Password in the BIOS. I don't appear to have such an option in the BIOS, only an admin password and boot-up password.

  
  


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  Using Magician. It has a "Data Security" tab, but I don't fully understand the options and suspect that none are applicable.

  
  

The info in this question and answer helped but didn't answer my question.

Clearly then, what I would like to know is how do I encrypt my solid state drive in the HP Envy 15 or am I in fact out of luck? Are there any alternative options or do I have to either live without encryption or return the laptop?

There is a similar question on Anandtech but it remains unanswered.