I guess if i worked on my own I would have no problem doing this in 3 days, that is on the generous side.
£6 per m2 would have you on £154 per hour. Not bad going if you can get it.
I would certainly charge £6 m2 if it was 1 room and a one off customer but this job is 7 rooms at 88 m2, at that price your bill would be £3700, you could probably replace the floor for that.
i would re think new broom, no offence jonni, can't have the welsh getting rich before the geordies.