Thanks everyone for all your help - i feel well supported and advised! i am going to search the site for details on ordering Bens kit - and then i will start.
re. the fact that the salt system IS chlorine (which i didn't want) - hmmm...yes - i do realise that sounded a bit silly. But i am also realising that it is probably the bad management of chlorine that gives it its bad name.
Also from all i read, the chlorine produced in the salt system is not nearly so harsh and does not have the other added ingredients (albeit so-called 'inert') that chemical chlorine does.
Thanks again