Thanks very much for the replies from IRENE and GOLDEN. I will study the suggestions given there before I reply to them particularly. There is one further difficulty I have with this planned process which I didn't fully explain before and that is that the data I have is in a printed file only , i.e. it is not yet in digital form. I requested the source of this data if they could present it to me in , say , a .pdf form or in an extract from a data base but they say that will not be possible due , I presume , to information protection concerns as it involves financial data. I presume , therefore , in this case the very first step would be to convert this data into digital form by , for instance , scanning it . Would you agree with this ?