Is this my boundary fence?

[Ripriderockit]

I bought my property 20 years ago. The boundary is showing as red. The shaded area to the right is a path that allows neighbours access to their back gardens as the houses are adjoined.
Because on the deeds there is a red line between mine and my neighbour's garden does this mean I own the dividing fence?
We don't get on at all and the fence will need replacing soon.
Will add photo for clarification.

It's the T that denotes a boundary you are responsible for so that's the back fence. I'd assume others are shared

No, the red line delineates your property (ie on the title “the land at no 2 acacia avenues edged red on the plan”)

On the issue of responsibility for the others check your legal report. If you bought from new the transfer will say, if it was not new there are replies to enquiries which say who has maintained in the past (not conclusive, but useful)

Thanks all that makes more sense now. I do have more paperwork somewhere.
But if it is a shared fence and I want to change it and the neighbour refuses what happens then? That situation could potentially be vice versa too. If they wanted to replace with something we didn't?

From that picture you are responsible for the back fence. It could be the others are shared or the neighbours are responsible.

You’d need to come to an agreement with them - it’s not unusual. We’re just agreeing a new fence with our neighbour behind us. The alternative is that you can always put up a new fence / hurdle etc within your own boundary

Hedge not hurdle!

You can put up your own fence next to the existing one as it will be on your land.