MMV - trying to work out how to add to a file name

Hi all,

I can usually nut problems out, but I'm stuck with this newbie one. I'm trying to achieve adding some text in bulk to multiple file names:

ie - from:
TV Series 001.mkv
TV Series 002.Mkv

I want to change all files in bulk to add the text before the three unique series numbers

to:
TV Series S01001.mkv
TV Series S01002.mkv

Any tips, assistance, or a method would be grandly appreciated.