Wow, I didn't know GH did that! I know him better as Eddie Yeats in Coronation Street, but I liked him in Keeping Up Appearances too. That is one hella cool titbit of trivia!
GH is actually a very skilled actor. I like him very much as Vernon Scripps in (another British-show) Heartbeat.
I'll think that Yellow Submarine will be very interesting next time I watch it, now when I know who Pauls voice is.
It could have been fun, if it was the real John, Paul, George and Ringo who did the voices.
But GH & co. does it well too.