Extract POS- Terminal Numebrs

May be the following will work in your case
D4=LEFT(LOOKUP(99^99,MID(SUBSTITUTE(B4,CHAR(10)," "),ROW(INDIRECT("1:"&LEN(B4)-15)),18)+0),8)
Try this and copy towards down

This also works however there are 3 entries in your test data that appear to have Carriage Returns after the DR which cause it to lose a character.

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Anybody know however why the following I was trying wouldn't work? just returns a #VALUE error

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Use this array formula in D4, copied down:

=IFERROR(--LEFT(LOOKUP(10^100,MID(SUBSTITUTE(B4," ","a"),ROW(INDIRECT("1:"&LEN(B4)-15)),16)
/ISERROR(--MID(" "&B4,ROW(INDIRECT("1:"&LEN(B4)-15)),1))/ISERROR(--MID(B4&" ",ROW(INDIRECT("17:"&LEN(B4)+1)),1))),8),"")

Array Formulae are a little different from ordinary formulae in that they MUST be confirmed in the FIRST CELL ONLY by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. After that, the array can be dragged down as normal, to cover the desired range.

You will know the array is active when you see curly brackets { } - or "curly braces" for those of you in the USA, or "flower brackets" for those of you in India - appear around the outside of your formula. If you do not use CTRL+SHIFT+ENTER you will (almost always) get an error message or an incorrect answer. Press F2 on that cell and try again.

Don't type the curly brackets yourself - it won't work...