He reminds me of John Simm.
It's not so much that I think he looks that much like him, but more the way he just seems to be.
It's hard to put my finger on exactly why, but he just reminds me of John Simm in something to do with how he carries himself or something.
If you put a side by side photo comparison between Neil and John Simm, you might say "I suppose he might look a little bit like him, but not much", but it's more to do with the way he comes across when he moves and speaks.
A bit like how Michael Sheen the actor can somehow appear to be become the very image of Tony Blair, or Brian Clough, or any other real character he plays without necessarily looking exactly like them.