I moved into an older property several months ago and trying to rectify a couple issues with the garden bed / retaining wall. First image is a rudementary retaining wall between the top and lower level from previous owner comprised of some bits of would a brick and half a broken pot plan. Seeking advise on how to rectify this whether it be a wooden retain / brick etc.
The second image is where the concrete panel and post meets the edge of the corrigated fence, there is a clear gap resulted in sand slowly spilling out. Im replacing the old artificial turf so if like to plug this sand leak prior to laying the new material. Unsure how to do this weather i use some aluminium flashing or something along those lines thank you

