Hello Colin,
I would use a product called Osmo Wash. & Care, diluted with warm water in a sprayer.
Rotary machine, with a green pad on this ocasion. On floors that are not so dirty and of domestic use I would use a red pad.
Spray 4sqm of floor at a time and work it in for approximately 2 minuets. You should see the grime coming out of the floor. Then vac off with a wet vac.
For good Wood Floor advice search for Osmo online.
I hope this is useful.
Paul Coulthard