Okay Bunjies here's my summary although I'll probably miss something:
Richards's dead, at funeral Trudie listens to the voicemessage from Katie. Confrontation scene in garden where Trudi falls out with them all (Siobhan & Jess for not telling her).
Scene at Katie's house is to tell them all that Jess has ovarian cancer (Katie bumped into her at hospital), they all agree to 'be there for her' despite the fall out.
Siobhan is going out with photographer bloke, Dominic is in NY (at funeral his wife had begged her not to take him away from her so Siobhan made a big deal of wishing them both well). Photographer throws her birthday party which all of them go to although Katie & Trudi not speaking. Dominic turns up at party unannounced, obvious tension between him and Siobhan.
Something happens with Trudi's business which is too dull to bother explaining.
Jess tell's Mark about the cancer, he is very upset but they're not together and don't get back together. He does return the money to Siobhan though and it's meant to show "he's good really" I think.
Katie has been in denial about her situation with Richard etc but finally breaks down, Joanna Lumley decides to stay in the family house rather than go back to SA.
Jess has an operation to remove the ovary which has the cancerous growth on it, some talk about still wanting to have kids if other ovary okay, think we're meant to assume that she can still have children as op goes well. That Simon bloke is on the scene looking after her, maybe they'll get together but we don't really care.
Trudi and Katie make up at some point after Richard's daughter runs away to Katie's house. Trudi realises that she's really angry at herself - nonsense, as if you really would forgive that.
Siobhan finds out that Dominic isn't with his wife anymore, cue last minute dash to airport in hideous clothes to tell him that she loves him. They kiss at the top of the escalators above the Easyjet desks just before security (I spend a lot of time in Bristol airport).
Final scene in hospital where Jess tells them all that she's in the clear, group hug, end.