Hi OP. I love a long book to get involved in too, and all the ones you mention I have really enjoyed.
Some great suggestions above. YY to Kate Atkinson's Life after Life plus A God in Ruins, A Suitable Boy, and A Fine Balance which is one of my all-time favourites. If you enjoy A Fine Balance, also try A Disobedient Girl by Ru Freeman.
If you like Rose Tremain, I recommend Restoration and the sequel Merivel. Completely different from The Road Home - she is such a varied writer - but very very good.
Also Sarah Waters. Thinking about The Crimson Petal, I think you'd like Fingersmith in particular. The Paying Guests is also really good.
One of my favourites, less well known and which I'm always recommending, is The Observations by Jane Harris. Really entertaining, with a dry and funny narrative voice.
I'm just about to reread Sacred Hunger by Barry Unsworth, set on a slave ship in the mid 18th century.It won the Booker in 1992 and I read it shortly afterwards so I don't recall it in detail but remember being totally absorbed by it, so looking forward to that.
Another Booker winner but more recent is The Northern Clemency by Philip Hensher. Set in Sheffield during the Thatcher years, and follows the lives of two families against the backdrop of the miners' strike and general political unrest.
As you mention Brick Lane, also try Small Island by Andrea Levy. Even better IMO.
And you can't beat the Victorian and Edwardian period for big satisfying family sagas with a bit of social context to add depth. Middlemarch by George Eliot, The Old Wives' Tale by Arnold Bennett, and South Riding by Winifred Holtby are all great reads.
And of course there's always War and Peace - that would keep you company for most of the winter 