Just purchased a flat in the UK, the exterior door has a cheap Yale para cylinder with buzzer system and there are only 7 flats in a fairly low crime part of the UK. My flat has a high quality mortise lock but just an inexpensive cylinder. Local Screwfix store offers Cisa Astral S and a Yale Superior 1 star as well as the pricier Yale 3 star cylinders. Roughly £35-£57 each.
Is the Cisa Astral S adequate protection?