If you think I'm quet on here, think of my poor van!
The amount that I'm visiting this forum is in direct relation to the amount that I'm getting to tinker with the van. It's sitting lonely and cold on the drive.
Thanks for the feedback everyone. I started far too many threads at once (one for each issue), so haven't kept up with all of them. Especially when I'm not sure how to respond, or what to do next. I'm more of a computer geek than a mechanic, so I have no idea what I'm doing with this stuff.
@Mocki, I zip tied everything to stop them moving around. When we bought the van, it was all just dangling underneath! Swaying around and probably hitting the ground when going over bumps. I've no idea how long it may have been like that.
@davidoft1, Thanks for your suggestion to reconnect the pipes and see what happens. From my current level of understanding, I don't know enough to do that. Are you aware of any videos that could walk me though it? I have no idea what pipe will I need, where I should connect it, how I should connect it? etc.
@TONYT25T25 and Oldiebut goodie, thanks for helping me to identify it.
I think I'm out of my league with this.
If anyone has any suggestions of what to do next (in much more basic terms than 'reconnect it'

), or if there's anyone that I could take this to (I'm based in Somerset), I'd really appreciate it.
Thanks,
Damian