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"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Is the wall falling away from the house, or the house falling away from the wall ?
If it's a long wall and the mortar mix had too much cement in it it will crack along the quoin like that from thermal movement.
If it's a retaining wall in any part, higher ground level on one side, then you need to dig out behing the wall, whack a load of terram between it and the soil and feel the gap with 10mm shingle and add weep holes to the wall, otherwise it will blow apart.
It just looks like a shitty wall, just rebuild it next weekend.
Only, no need to rebuild ......allow approx 2 litre tub of epoxy subsidence grout repair and ram pack the opening join on the abuttment - if you want to do a 101% job grind out some chases and install helical bar stitches at 20cm centres
You can even buy a complete helical bar and epoxy resin kit from screwfix for £155 although you will need a litre of extra epoxy resin ..........if it is an engineered or semi engineered retaining wall with a hydrostatic head of water behind it you will need to do more serious work ( see Sambostar comment ) but I doubt it is otherwise there would be evidence of water penetration ie algae etc on the mortar joints and the exterior face of the blocks .
there is no big issue here.
For £155 I'd rebuild it personally, at least repair it from the footing up, but don't know the extent of the wall.
that...
You have failed as a man.
being unconnected to the house is not an issue however, most boundary walls are freestanding or spanning between piers.
The crack can be easily repaired but the crack is the symptom not the cause.
It looks like quite a low spec construction so there are plenty of things to consider but usually things exhibiting fresh patterns of defects long after construction usually end up being caused by weathering / rainwater / changes in groundwater etc, mechanical damage or the old favourite, drains.
I wouldn't lose sleep over it.
although a wider photo showing more of the wall would help to see if it is settlement going on to the right hand side, and a picture of the top would of help.
http://www.screwfix.com/p/sabrefix-roll-edge-restraint-strap-bend-500-x-100mm-5-pack/85398?kpid=85398&cm_mmc=Google-_-Product Listing Ads-_-Sales Tracking-_-sales tracking url&gclid=CIC_7rz09tECFUmNGwod1XYL0Q
I`d go for the latter option as you`ll be done in an hour.