Thanks bud.
I’ve attached a couple more pictures but there’s no lights and it’s a bit of a mess in there at the minute so hard to get anything decent.
The picture of the outside, you can see the black marks on the wall for the new proposed opening.
Inside has these pillars.
I was thinking could I prop up the timber lintel as you suggested and build a new pillar at the end of the new opening ?so it will be the same as it is now just wider apart, along with a longer timber lintel ?
Thanks again guys 👍