The garden walls both abut the main building allowing moisture to migrate into the building and are also a terrible cold bridge.  One garden wall was removed and replaced with a fence but the other side had to be retained on request from the neighbour.  To minimise the impact, the wall was rendered in lime to allow it to dry out and a lead saddle was installed again to keep the local part of the wall near the building dry.  The lead was dressed into the wall at an angle to assist in water running off away from the insulation (on the right in this photo).  You can also see the injected vertical DPC, the holes of which will be covered by the insulation