The Walking Dead star Andrew Lincoln has confirmed when the long-awaited Rick Grimes spin-off movie will begin filming.Lincoln left the long-running series two years ago, but news of a spin-off film have been discussed for some time.Speaking to Extra, Lincoln gave a further update on the project saying “With good intentions – and if everything works and I can leave my country – I plan to be back in America filming in spring/summer.You can watch the full interview here:Lincoln had previously said