Long story short, I have a new laptop, upgraded to 64bit from my previous 32 bit system.
Didn't think I owned the 64 bit version of Splat so I just installed CbB.
Turns out I own both 32 & 64bit versions of Sonar and I could have installed Splat first.
My question is, can I go back now and install Splat over the CbB version, and if so would I then have to install CbB again?
I don't want to have to delete everything and start again as it takes many hours of setting up to get things where they run smoothly. I think I would rather just run with CbB rather than do a complete new install. Maybe.....

Should be OK. The installers should not overwrite newer files. But if Platinum does update the shared files rerunning the CbB installer will fix it. Installing Platinum and its add-ons will not affect CbB config other than make Platinum content available to CbB.

Thanks Steve, I'm going to give it a try.