Hi David,
Thanks for the reply.
I do find it strange that just after deleting a component while creating an MST you are unable to quickly undo the change, after all the component is most likely inside the underlying MSI.
Anyway, I resolved my problem by opening 2 separate copies of my MSI (one with the MST applied) in ORCA, and the cutting and pasting the rows from the Component, FeatureComponent and File tables from the MSI Orca to the MSI & MST Orca - and Bobs your auntie, saved the MST, opened it back up in IS Editor and there is my component back.
Good old ORCA - My fave. I've used a variety of MSI generating tools in my time, but always in my toolbox is ORCA.
😄
Many Thanks