I have read some of the other posts from people trying to remove the fixed bottom bracket cup and having it stuck. This one is stuck but it is completely rounded.
Doesn't have the two flat sides to lock a spanner onto. Just two peg holes quite close together.

I'm just worried after trying so many things, filing two flat sides, etc etc, that it is fixed to the frame? Is this possible? It is an old speedwell frame.

I just want to confirm before I keep persevering that this thing is going to eventually unscrew.

Can anyone offer some advice?