Paul wrote the most touching, eloquent tribute to his friend and co-worker in music, Geoff Emerick, on his Instagram. One of the most moving I've seen him pen to a friend and Beatles People person who passed away. Emerick must have been extraordinary. I want to read his book. By all accounts it's a great read, very interesting, recounting very special times.
Yes, Stuartshire, it's on Paul's home page here, too, accompanied by the most wonderful picture of the two in Paul's recording studio. You can see the love between the pair. No doubt you've seen this tribute, too, by now.