actually a bit sad replying to my own thread but watched ballero last night in which the above news came under discussion so its really a bit of an update....
they produced a card with calculations... estimate of the increases basically
an average 100,000 house catastal value will have a market value of 300,000
they used a formula averaging out catastal values as 1/3 market values
estimated ici now 370 ... after revision 1370
of course there will be areas ...say the molise on a remote hilltop where the market value will not be three times the catastal value...conversely rome city centre or milan will maybe be five times
so these are average estimates and it seems where market values have increased more dramitically over the years the increase will be higher... quite a bit higher