Thanks very much, bnt.
I'll take a look at ImageMagick right away.
If Microsoft's SyncToy can be invoked* as part of the same script that invokes ImageMagick I'll take a look at that too, else I'll stick with Karen's Replicator given that it works flawlessly and has all the configuration options bar scripted invoking that I need.
Cheers,
XV
*Ideally from one script I want to scan for new photos and for each that is found, as it is found, resize and save the result on the mentioned network drive whilst leaving the original untouched.