No doubt the Attenborough family will be acknowledged but their generosity to the city is widely (and justifiably) recorded already. The project will serve more good if it highlights some of the less famous.
I'm backing suffragette Alice Hawkins for a second plaque (she has one at the Equity Shoes factory on Western Road where she worked; I am assuming that the building still stands). Her significance is summarised in the publisher's blurb for Alice Hawkins and the Suffragette Movement in Edwardian Leicester:
"The campaign for the suffrage is perhaps the best-known aspect of women's political fight in the early part of the 20th century, yet little is known of the local women who engaged in this struggle. Indeed, the assumption that only wealthy women were involved in the militant campaign has led not only to the distortion of the WSPU membership, but it also neglects the significant contribution made by working-class women within it. "