It would be awesome if it was marble!! Looks similar to the link you posted, but I am in Australia, marble cladding is not very prominent/used here, so I didn't think it would be? Anyone else to second Bodo or give their thoughts?

if the fibro is in good condition, simple paint and enjoy your gorgeous vintage home if there's any damage you can replace the old fibro with a modern cement sheet using simple timber battens (looks like the old curved fibro cover strips) and making sure to add suitable insulation...the advantage of using similar thickness cladding is there's no expensive alterations needed around windows and doors although, if you decide to remove the old fibro it's quite expensive to have the professionals do a big job but check the latest regulation and you may be able to replace small sections at a time

Probably 15 years ago I did a shop front in what I think was called Engineered Stone , and I think it was made in China . Dreamers reference seems to be actual stone , the stuff I used seemed to be essentially stone ground up with filler and cement , and poured into moulds . Basically , the panels were 100cm x 50cm , and the pattern repeated every panel , and then there were internal and external corners available too , as well as sills . The stuff I used ( its still in place ! ) looked pretty authentic , but tap it and it has an almost hollow sound to it . Does yours 'feel' real ?

Thank you for your comments everyone, much appreciated. I am leaning towards Monument for the windows. The house is a late 70's build and the extension is at the back of the house. The extension is really just filling in the outdoor area to make it an all season room. We will be cladding the west side and then have double glazed windows/sliding doors on the north and east side. I like the look of the Axon cladding. We will use the same cladding for the front of the house because we are also changing our front entrance to enable us to turn our study into a 4th bedroom.