Many thanks for your quick reply. The SSD isn't part of the RAID.
I tend to disconnect any drives apart from the SSD, to make sure that Windows 7 Installation doesn't install the windows 7 boot partition on another drive, and installs on the correct drive. I have seen some odd things happen over the years, and I think it was Jaquith from this forum who wrote a very detailed and interesting installation guide, which I have often referred to along with one by a guy called Sean which also offers a lot of ideas and tips. (http://www.overclock.net/t/1156654/seans-windows-7-install-optimization-guide-for-ssds-hdds)
Maybe I am being overcautious!!