Hi Nathan, sorry didn't see these comments earlier.
w/154277741 put as NSL as there are no signs or street lights. One end does seem to connect to 50mph, however just seems to be terminal signs are missing.
w/973553914 being 30mph because there are street lights and no signs saying its NSL
w/46463934 would be single carriageway as the A24 here is just two one-way roads splayed apart, rather than a dual carriageway as there is a significant amount of non-highway land between the two roads.