Well took him to our usual vets this morning and the vet said although there is discomfort in his bladder, his bladder is empty so he must be going. I asked if the blockage could be the other end which isn't allowing urine to get into the bladder and the vet said that if that was the case he would be in a lot of pain, meowing when trying to wee and also off his food, which he isn't.
She gave him an anti inflammatory and gave us a defuser to see if he's stressed. She said to watch him over the next 24 hrs and if he's still going but not actually peeing, to take him back.
I mentioned the fact that the emergency vets said the lining of his bladder seemed thickened and my vet ask if she scanned him to which I replied she didn't. She then said that she wouldn't be able to tell if his bladder was thickener by just feeling his bladder. So I'm glad I didnt go ahead with all the tests the emergency vet suggested.
So I'll stay home with him today and keep an eye on him but fingers crossed it's nothing serious!