Thanks Peanutter and Mildez.
DS1 was also really advanced linguistically (and with everything really) DS2 has been on a more normal schedule with everything else and so I thought maybe my opinion of his verbal skills was just suffering from comparison to DS1. We'll see maybe he'll make progress soon.
His communication is pretty limited. He randomly points at the dinner table to things until he gets what he wants (sometimes it seems it was actually already on his plate but his mouth was full so he just hadn't picked it up yet...) or we know that if we say 'water' and he starts crying that means he wants some water.
Dr didn't suggest a hearing test. Maybe she will if he hasn't caught up by the next appointment.
He had a hearing test shortly after he was born and all was good then.
He doesn't use a dummy.

I'm a bit more relaxed about it now. He is certainly progressing in different ways and we'll just keep a bit of a closer eye on him and see how he goes. Maybe everything will be fine, maybe he'll need a bit more help but we'll cross that bridge when we come to it. (And I'll try not to worry about it too much over the next few weeks )