I'm with Chris, this ain't no Phyllostachys, possibly a well grown sinobambusa, some pics of the branch pattern higher up would help, but tropical stuff another ball game to most on here
But there's enough info to rule out Ph.
BTW< many thanks Peter etal,for getting this up and running, not sure why as it's the same old folks, but it dose seems like a friendly, fresh start...
So here's hoping......