I disagree midsomar - there is no need to patronise the rest of us. I (like others I presume) was not really giving it my full attention, I was also on my phone. And that's because it looked like a run of the mill drama which might not be worthy of my full attention. And so it turned out. I was only watching it because I liked some of the actors, and on the off chance that it might be one of the good ones, like 'Broadchurch' or 'Unforgotten'.
It is up to the people who make the show to set out their stall, show who the characters are, etc from the beginning. If it grabs people's attention, they can then afford to get more cryptic. It is a week day evening ITV drama, FGS, not War and Peace. Hopefully it might develop into something halfway good, as they have attracted some good actors, but I'm not holding my breath. But at the beginning of yet another ITV drama, I wouldn't have minded a bit of expository dialogue really, why do the writers feel they're above that?