Well guys, many thanks for the suggestions...
I've tried out most of the ones you listed.
And the winner is......
JanoEditor!!!
@stefcp2, I owe you a beer! :-)
It seems to be the quickest to load, uses minimal RAM and has a great set of features, without being too overblown...
Highly recommended!
... now I can finally get down to giving my User-startup a good thrashing! :-)
Cheers,
Mike.