Indeed BDAqua, I've come to realise that most of what Google comes up with is irrelavent to what I'm looking for. I keep using it though in the hope that something useful comes up! Hmmm.
Back to the issue, the first Apple guy I spoke to didn't seem to know a) that the apps would just pop out of the bin if you put them there and b) How there came to be 2 versions of each. He eventually put me onto a senior chap who confirmed I would have to delete the 'Mac HD' (he took me through it) and reload it.
I suspect the issue was caused because I was prompted to migrate from my old machine before my brand new machine had loaded its own software.
Therefore, by the time the latest Mac OS was loaded, there was already the OS, complete with apps, from my old MacBook there.