Thanks for your kind offer, but as you will see, this query started in February and since then the friend I was making the enquiry for has visited the Harris Library.
However he was unable to see bound copies of the Preston Herald which covered the time period of his interest. On asking to see these he was told at the enquiry desk that they were unavailable, with the explanation being something like "we cannot reach them at the moment". A subsequent e-mail to the library some weeks later enquiring if they were now available received the reply, "The volumes you wish to view are unfortunately unavailable until further notice." This e-mail reply was in May, I don't know if the situation has changed yet.