William Sargent is keen to talk about a challenge facing him and Framestore, the animation, visual effects and creative production company he co-founded in London in 1986, and chairs today having recently stepped back as chief executive. The Dubliner’s multi Oscar-winning firm employs over 6,000 people in 11 cities around the world, but he’s expecting to spend at least another year trying to figure out its hybrid working policy, and what that will mean for reconfiguring its offices. The last time we met was last September one morning at a coffee shop and bakery near where he lives in north…