Lathe and Plaster Wall Is it a Supporting Wall?

[Floppy1234]

Hello,

I have recently moved into a 1900 terraced house.

The bathroom upstairs is in what was originally a 3rd bedroom.

The doorway for bathroom has been made behind the original bedroom doorway.

The upstairs landing is very small and the original doorway is a real pain.

I would like to remove the frame and small wall (60cm) which is front of the bathroom .

It is lathe and plaster wall with black mortar stuff in parts and some of it is empty, just lathe and plaster.

There is a wooden lintel running across the top of the doorway attatched to a vertical timber running from floor to ceiling, with an attic above it.

How can I tell if this is a supporting wall or not, can anyone help?

I presumed it was but when removing some of the plaster today and seeing lathe and gaps I wondered if its not actually a supporting wall. There is nothing above the wood lintel above the doorway.
Many thanks for any help.

 

[^woody^]

Look in the loft

 

[Floppy1234]

Thank you. What will the loft tell me?
Is there something I should be particularly looking for?

 

[Keithmac]

The vertical timbers alongside the door frames could be supporting the ceiling, my dad's house is L a P and they are tied into the joists.

 

[^woody^]

Thank you. What will the loft tell me?
Is there something I should be particularly looking for?

See if anything is resting on it.

 

[Floppy1234]

Thank you both.
I have had a look in the loft.
The vertical timber is going through the ceiling into the loft.
The doorway lintel is attached to this and a timber in the attic also looks like it's attached he'd to it.
The vertical timber is not sitting in the floorboards though,a few mms above the floor.
Think I'm even more confused now.