Thank you for your help
I will call Lenovo later - It's a public holiday in the UK so they may not be available, in which case I'll try again tomorrow. I'll update my progress here - I'm doubtful, though, as the ThinkPad is out of warranty.
I have done a significant amount of searching for help both on this forum and the internet in general and, though I'd love to be proved wrong, the best summary of the situation that I've found so far is available on this very forum:
First I called Lenovo/IBM support. Appears this is a known problem.Source
In the old days, Win XP and Win2000, during the installation process on a Raid 0 config, there is a point that you can hit CNTRL-S to insert third party drivers needed for the install. This is the point where a Raid 0 driver could be inserted so the Windows would be built with it and later boot successfully.
It seems that Lenovo Recovery4 process never took this into consideration for the folks who were switching to Raid0 from an normal single drive W700.
Lenovo/IBM first said, just get the Intel/Raid 0 driver from the website and install it. Well that is impossible if you cannot get the system to boot. And there is no way to insert this driver into the recovery CD/DVD that we are suppose to create when we first get our systems. A real catch 22.
The solution. Lenovo/IBM sent me the actual Recovery CD/DVD to rebuild the system. Since my system is under warranty, the cost was zero. Slower process, but very effective. These CD/DVD have all the necessary drivers to build the system. The raid 0 was a snap to get up and running.
It does seem like a major oversight - that their own recovery media is unable to successfully restore onto a RAID array. Especially seeing as I followed their own instructions, here
I followed these instructions exactly (creating the recovery media prior to making any changes to the RAID settings, as advised) but it was not until I ran into problems that my searches suggested the problem I've outlined above. It is slightly disappointing that Lenovo, aware of the situation, do not even mention it in that support document. Indeed, the support document is specifically for people in positions such as mine - Owners of a W700ds who wish to create a RAID volume.
In summary; I fear my options are twofold - (1) Find a way, if it is even possible, to somehow add the RAID driver to the recovery media or some alternative way to restore using my recovery media or (2) Obtain Lenovo's recovery media directly which, if the above quote is to be believed, has no such problem. I would be incredibly grateful for any help in resolving this, using any of my suggestions above or any alternatives.
For now, I will contact Lenovo and shortly make a request in the 'For Sale' section here... Fingers crossed!
EDIT: Lenovo support closed today. I'll try again when possible. In the meantime, any advice? Please?
EDIT 2: Called Lenovo today and they were not able to offer support as the ThinkPad is not in warranty. The best they could do was direct me to LenovoRecovery.com to purchase recovery media. They were not able to confirm that the media would differ in any way from the media I created using the ThinkVantage tool - E.g., whether it would include the 'missing' RAID driver or not. For the moment I'll keep an eye out incase there is an alternative available, but if it comes to it I may have to purchase and see. Will keep you updated, but any other ideas would be great!