I was walking my dog through high grass, in England. We came across a big spider. The web was almost like a bowl/tube. The spider was black but the back part was big and a white colour. We avoided that spider but we came across many more. I have looked them up but can't find a matching image or description.
Could be two I'd guess:
It's hard to completly identify but by the sound of the web shape and your description it is most likely a Labyrinth spider
At this time of the year, the funnel webs in our gardens are normally the work of Labyrinth spiders. Labyrinths are common, shy little critters, and being a dull grey-brown colour they go largely unnoticed. It's only when they start building their webs that they draw attention to themselves.
They are very common and not remotely poisonous to humans,
The only poisonous spider (that I'm aware of) in the UK is the false widow. Your description of the spider itself does vaguely match this:
Neither are aggressive though the false widow is more dangerous (still very unlikely to cause serious damage unless you have a heart condition or something)
I'd be interested to know which if any it matches?