Just to bounce this for the casual fan - plenty of seats available in S1B via the Ticket website. http://www.seagulls.talent-sport.co.uk/PagesPublic/ProductBrowse/productHome.aspx
There's a small block in S1A, which is actually the southern end of the east stand lower. I imagine they will trickle-release more in this block in due course. Few odd seats elsewhere which look like TE seats??
PG