Hey guys, my old brick wall needs some attention. I was looking at taking off the broken top stones and re pointing all the mortar when I notices the whole wall had developed a slight lean outwards. It is and L shaped wall with the short side intact, the long side is attached to the house and has begun to lean in the middle from what I expect is just the weight as a lot of the old mortar is weather beaten and breaking away. My first impression is that it would be stable with some tidying up and a good dollop of sand and cement. However, im interested to know if there are any techniques used to (even mildly) strengthen or brace this wall with minimal aesthetic change. Ideally something from the inside as the external side (which it is leaning towards) is a public footpath. Cheers for any constructive advice.

The expansion boards in my patio have deteriorated. Can I use a concrete caulk to fill the voids? What would you recommend? Thanks John