Thanks all......
Sukram
If you don't refit the wood, your seat will lower by 4cm at the front and 2.5cm at the rear.You can keep the angle of the seat by fitting 1.5cm washers under the front bolts, and 1cm washers under the second set.
You will also need to find shorter replacement bolts.
Keith - the Danish Oil came from Wickes, and is easy & pleasant to use.