Two questions for UK viewers of "Lark Rise to Candleford"

TV Arts

Is Brendan Coyle not in Season 4 at all? :-(  We got episode 1 in
the Bay Area last night, and Robert was off somewhere working. I
just searched for "Robert" in the S4 descriptions on IMDb (I didn't
want to actually read the descriptions so as to avoid spoilers),
and the only hit I got was about him being away. With "Downton
Abbey" being a limited series, I thought he'd be able to stay in
"Lark Rise," too. Drat. :-(

Are there really only six episodes in S4? That's all I'm seeing
on IMDb and

He was sent off on "work" elsewhere.  Kind of like how a politician
says he wants to spend more time with his family.   I missed the
raving lib.