I thought that I'd let you know that this parallel book was just released by the same author:
The Love Song of Miss Queenie Hennessy.
The Love Song of Miss Queenie Hennessy: A Novel - Kindle edition by Rachel Joyce. Literature & Fiction Kindle eBooks @ Amazon.com.
I got through 3 or 4 pages of
The Unlikely Pilgrimage of Harold Fry before I bailed -- it's just not my type of book -- but I know many people who adored it. Here's hoping that you love this parallel book (also which I will not be reading) too.
She also has another book that was written between these two. It's called
Perfect. Actually, that one sounds a bit interesting to me.