My guess:
"Whistle! WHISTLE!
When I heard this prick Trent wanted to write a book about Richmond at the start of the season I thought it was the stupidest fucking idea I’d ever heard in my life.
Of course you all know how it turned out so I guess he looks like a genius now. That fucking arsehole.
Oh yeah the book is actually pretty good I guess. So fuck off and start reading it now."
Not to be that guy, but Roy Kent does like books. He reads to Phoebe in Season 1 and in Season 2 he gets really into The Da Vinci Code.