Thanks Cas and sorry for not replying sooner...all been a bit mad! I saw the salt layer recipe, that looks a goodie. This year, however was just a trial run Two of us spent two days raking down 40 -50 odd trees of olives that were just starting to turn colour and ended up with a bin of 313 kg which we sent off to the press That gave us 45 litres of grassy peppery oil...delicious! That is a yield of 14% which is on the upper end of the scale. Very happy with the result. The old fella we bought the place from said one year,( with a lot of extra help) they got 4.5 tonnes and over 600 litres of oil...so could be a viable little side business.
Anyway, family and friends will enjoy the spoils of this years efforts
And thanks again for the preserving tips...I have copied to a note file for FR.