I've gone through all the usual spooler stuff & printer settings & they are the best part identical between the printers, so i'm confident it's not anything there (famous last words though...), Ctrl P isn't an option as the software generating the pages doesn't open or preview the pages.
The Dell dosn't stop as such after each page, but it's releasing rollers & such like after every page which makes it slow in comparison to running a multi page single document - which it does continuously / as expected / fine.
Thanks.