Thanks for the reply. It seem worse in places and it didn't affect the whole floor. I'm waiting to speak to the vendor to see what was used on the floor as it looks like it has been DIY varnished judging by the marks on the skirts etc, to prepare the house for sale, as is empty an on the market.
The floor is unevenly coloured with previous stains underneath, paint, rubbing etc, if it comes to stripping is it a case of the belt sander or just removing what looks like polyurethane varnish top coat?
I am waiting for a call from flooring specialist but any info I get will prepare me for speaking to the vendor.
Cheers once again.