No idea then, at low level they might have been retro damp coursing, scattered around the whole wall cavity insulation. Just possible someone has inspected the wall ties with a borescope inspection camera and used them to plug the holes rather than cement.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local