Hi Gareth,

We moved into an early 70's house last year.
It also has original Parquet flooring.
It was in a similar condition to yours.
We had a quote from a company that specialised
in floor restoration and they charged £30 a
square/m. It would have worked out to about £2K!

We hired a floor sander and used the finest 2
paper grades along with using a belt sander for
the edges. The teak turned a very light tan colour
It looked rubbish. We were concerened....

However... once the floor varnish was added,
Ronseal diamond hard gloss.
The results were simply stunning! A deep colour,
beautiful grain. A number of people have commented
how nice our floor is. Well worth it.
(BTW to buy new parquet and get it fitted would
have cost us thousands.)
Total cost about £150 plus 3 days hard graft
and lots of orange dust!
Probably the most cost effective DIY we have
ever undertaken but you have to be prepared
for dust, white paper suit time!
I will upload some photos for you to look at.
If you want any more info let me know.

Matthew