This is typical of what a lot of these damp firms are doing, they don't ever find the cause or even look for the cause they go for the membrane one. There are quite a few knocking about there is the drilling the bricks and injection, raking the joints and using a cream, drilling out and filling with plugs, taking out a perfectly good dpc and installing a modern one. There is the blue brick method of removing the bottom course and replacing and maybe install a cavity tray. All them methods are unnecessary in my opinion, I have fixed hundreds of damp jobs without any of them methods with just solving the problem and rendering with sand and cement. A lot of them methods are very costly and are a massive cost and disruption, this has got to be one of the biggest cons in the building game and is messing up a lot of properties.