Speed limit dual carriageway question?

[Bluecray]

I was on the A10 to cambridge, and there's quite a few T junctions on this road with speed cameras near the junctions.

We all know that dual carriageways with a barrier in the middle, speed limit is 70mph.

Going through the junctions I slowed to 60mph, but I am sure I didn't see any speed limit signs that or I missed them.

Question - what is the speed limit on a dual carriageway where theres T junctions????

Thanks.