Grantchester: Doc Martin star joins cast as season eight begins filming

• Good news, Grantchester fans - filming has begun on the detective drama’s eighth season, meaning that it’s not long until we see Tom Brittney’s Reverend Will Davenport Robson Green’s DI Geordie Keating back on our screens. MORE: Grantchester stars delight fans as they team up for new BBC drama What’s more, it’s been announced that the upcoming episodes are set to feature even more guest stars - and one of them is a former Doc Martin and Harry Potter actor! Want to know more? Keep reading for all