Missing mortar on brickwork

Hi, looking for some help

We are redorating one room for a home office, completely gutted it. On an outside wall, a crack in the plaster was present (around 50cm) so we took the plaster away there to then plan to fill later.

When taking it back, it fell away easily and the breeze blocks were exposed, what i am concerned about is the major lack of mortar in between the breeze blocks vertically, seems non existant in places and area of the crack passed this area of missing mortar.

I dont know much on brickwork and if this is normal or not but i am concerned why no mortar is present, in another room we found a similar thing. Large cracked plaster and underneath missing mortar.

Is this ok does anyone know and if not, any ideas what can be done to help? Much appreciated

 

House was built in the 1970s ish
Cheers

 

whoaa 1980s was good at xmas time! look at that tin

cheers lads, not that fussed about it being missing if it doesnt cause any structural issues i guess, does it really cause issues if mortar is missing?.
What i am concerned about a bit is on the vertical i posted about missing mortar, if i shine a light in, it looks like there is a hollow area inside!

Its hard to see but certainly looks that way, design of the brick? Doesnt look like the bricks are staggered either which i thought was the norm.
Ill try to post a picture in the morning

 

I dont think so mate, looks like half a tennis ball has been taken out of the breeze block work if i shine a light in. Some pics attached, 2nd one with vertical gap, half way up behind that bit of mortar is a hallow area before the thickness of a breeze block, sorry if pictures are rubbish.

Is breeze block responsible for the main support? sorry if this is naive but a friend tells me that its really for ventilation and not for the support of the house but after seeing the state of this brickwork i am a little worried especially as the front of the house, has a crack similar but much longer. Both have been present for a couple of years but always thought it was just the plaster failing.

Should i fill this with anything that may help support rather than just fill over? advice much appreciated

 

Here you go

 

Another

 

Just spoke to a friend builder, he tells me that our house was built as a row of houses and as its sandwiched inbetween houses (terraced) it is likely to move over many years and cracks are something that will happen due to the nature of how it was built and these days they are not built in this way to prevent such issues.

Outside, all i can see is a hair line crack in the mortar of the red brick, it follows the mortar down a little.