Yup, they're still there but only 1 is accessable, the other being bricked up and buried under brambles (I have piccies but I'll not steal your thunder mate ). The open one has a spectacular view over the plain northwards....If by the MG posts you mean MV 4 & 4a on Mitchells Hill north east of the Halt then yes if they're still there I'll be posting them for sure....
Don't forget the anti-tank poles on the top of the embankment north of the bridge.
I'm loving your trip and photos along this stopline, cheers mate.
Here's a view of that 6 pounder plinth, hopefully someone can confirm whether it is just that or not: