I'm in the process of purchasing a property, however, upon inspecting the attic I discovered 2 vertical cracks in some breeze blocks. The property is a 3 bed terraced house from the 60s. I'm hoping for some advice or opinions on whether or not this is something to worry about. There are no cracks or signs of issues on the ground or first floor walls, neither externally nor internally. I'm wondering whether the cracks could be caused by temperature changes causing the wooden rafters to warp or move, which would then move the breeze blocks causing them to crack? The pictures are screenshots of a video, so not super clear, but the first crack is probably about a meter long from top to bottom, then to the right of it there is a wooden rafter or tie and to the right of this there's the other crack, this one starts further down the wall and reaches downwards as far as I can see. I didn't have the opportunity to measure the width of the cracks as the cracks were discovered upon our second viewing of the property. I would estimate at least a 10 mm gap at the widest point of the largest crack. Apologies, I would upload a video if I knew how. Hoping for some feedback. Many thanks in advance!