There's definitely a wind issue, but it coincides with him not pooing, yk? So yes, very likely gas pain, but it eases once he's poo'd -it's been a pattern for a few weeks, but he's usually gone by now.
Yes, he's ebf and no solids. And no, never had particularly solid poos (although some were quite hard when on gaviscon), but they were generally a paste/mustard consistency whereas this is liquid.
Tummy massage eventually settled him tonight.