From the last episode it looks like the main cast all double up as the plague people.
They do. You can pick out who's who, some very obvious.
Love it, love it, love it, too.
I want the couple to have a baby who can see the ghosts and to also see how they react with the baby.
Maybe difficult to do on a 'technical' level (in terms of getting the baby's reactions' but not at all impossible for this team. They are so incredibly talented.
I creased up when Pat was having his talk with Mary about holidays, going from telling her how wonderful they were into having a full time rant about holiday nightmares.
Mary's subtle but brilliant reactions when he was waffling on about sunburn (which he was totally oblivious to) were mint..
ETA: For the most part, Robin is my favourite ghost, series after series but I love them all.