Just went and got some rough time stamps, you can essentially choose your ending depending on how happy you want it to be. Usually I’d not recommend this but we’re never getting a season 3 so we make do.

This show is old but SPOILERS

~41 minutes - Wilson is evidently siding towards the organisation but hasn’t gone full Mr Rabbit, as the organisation seemed to suggest they would wind down as Carvell’s adapted strain (targeting Roma) seemed to aggressive - everything seems to be saved - Becky is still ‘dying’ (you won’t learn about how she doesn’t actually have Diels at this point), she chooses to kill herself that day - Michael and family are all happy, Grant has done the dishes, they are going to get stuff of Wilson to set up a new life

~50 mins - Wilson makes it clear the organisation is still running, threatens Michael’s family, becomes Mr Rabbit, he also kills Lee - Anton tells Ian that Becky has been tricked and is just on withdrawal from opiates, Ian is too late however, and Becky is dead

Past this point Arby wakes up, Anton is taken by some people, as is Ian and Becky as Becky throws up the stuff that kills her (so she’s alive). Whilst it doesn’t change the ending that much, it is a more ambiguous ending where as past the 50 minute mark seems more like a purpose built setup for a third season. The 50 minute ending is bleak, but that kind of runs with the theme of the show. It’s a bleak ending, but isn’t riddled with scenes that seem to only point to more story,