Can you identify this bamboo?

I've got a stand of bamboo growing in my garden, in and amongst another tree or two. It's starting to grow through my lawn as well, so I'm assuming it's the "running" kind. ANyone know what species it might be from these photos?
I'll try to follow the tips to kill off the plant on the RHS website, unless anyone has any other suggestions!
https://www.rhs.org.uk/advice/profile?pid=210

I'll try to follow the tips to kill off the plant on the RHS website, unless anyone has any other suggestions!
https://www.rhs.org.uk/advice/profile?pid=210


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You can't see in the images very well but i think there's actually a third big plant in the mix too...