I went to my local hardware shop and hired a sanding machine and discs. I'd already bought some varnish for the floor, and having read all the articles I'd got on sanding floors, thought the procedure would be simple. Well, I was half right. However, the end product was not what I had intended. I sanded the floor using a coarse sanding disc, which resulted in an uneven finish to the floor. Not one of the articles I'd ever read had told me to use medium grade sanding paper (not until after I'd finished the sanding and the varnish showed the floor finish off perfectly)! I think re - sanding to improve the floors look is the only solution. Can't think of any other.