Many thanks, WoodYouLike. I appreciate there are coloured hard wax oils available but it would cost me 20 quid to return my Clear Satin and then reorder the new colour. Interesting tip you've given me about the wet finger - I think I had better sand some test blocks and see how dark it goes with...
I have extended a room and kept part of the old parquet floor, and in the extended area laid reclaimed parquet blocks. It is now all sanded flat, but is very pale in colour. The original floor was quite dark. I don't know what the wood is. I have Osmo Polyx Clear Satin hard wax oil at the ready...