Not an ex spurt, Kev, more an ancient drip, but does the printer have a cleaning function? The [hoto looks as though the cartidge has bled toner onto the paper. It's been donkey's years since I had a laser printer, but I have a hazy recollection of needing to run a couple of test pages through after a cartridge change [and a gentle/careful wipe of the roller mechanism that will have collected the toner 'dust'?]
Steve