It's a pleasant enough whodunnit but it's not the most historically accurate of things. It's also a bit lazy. I can understand why 21st century realities exist in a show set in the 1950s but you'd think the writers would make an effort to explain why racially diverse characters are apparently so common in rural England. At the time they certainly weren't as ubiquitous in this setting. In fact, they were vanishingly rare outside of the main cities so rather than doing uncommented on token casting they could have written the occasional backstory to explain these historically improbable people. Then there's little things like zero research on very specific things a writer only has contemporary understanding of. For example, in one episode a character refers to lidocaine and that word was never used in Britain during that period since it was universally referred to as lignocaine in the UK for at least 3 decades after the setting of this show. These things aside, it's not an unreasonable way to waste 45 minutes.
Review of Grantchester
