Modern drywall building method.

So a stone not a sponge?

 

Well with that "threat" of no lube, would imagine ur victim would "Squeel like a piggy"

 

They're film quotes

 

the stud will be spaced at 600 centres with track top and bottom screwed with jack point screws and plasterboard screwed on with 30mm screws.
stud comes in various sizes, 50-70,100mm. openings usually have 2x1 timber sleveed with the tin to provide for door fixing etc.with door heads/lintel having track cut and bent up each reveal.

 

looking forward to the before and after photos DA

 

Hmmm. Methinks an exploratory look behind a socket might have revealed the same before commencement.

Now, is that supporting?

Mr. HandyAndy - Really

 

As your builder can't tell the difference between metal studs and blockwork...

 

The thing that looks like blue cable - is that the radiator feed?

 

The new opening looks like to be 2030mm wide, so a lintel of min 2330mm (2.4m/8ft) is required. Cut out the block work so you can get full block out, as per diagram.

Is there a supporting wall onto p of this one in the bedroom?

 

If it's nonload bearing then you are fine but as I said the builder who told you it was nonload bearing also thought it was metal stud so I wouldn't trust him again.