Cheers kev
did the cement grout after the clean and rinse but before the seal, it was only 5 smallish holes so i just masked off the stone with masking tape and mixed a bit of cement and filled them in, smoothed them off and then we sealed the whole floor, job done.
best compliment i got was that the floor had been cleaned 2 or 3 times before by some guy but he had retired so they were looking for a new guy to do there next clean, the original guy had been cleaning stone floors for years, after they saw my clean they were gobsmacked at how well it had come up, commenting, "the last guy never got it looking that nice" and that was my first attemp. well happy.
yeah roll on my first marble floor, looking forward to it.