Level 2 or Level 3 survey?
Level 2: a visual inspection and report on the main elements and visible defects, often suited to conventional homes in reasonable condition. It gives condition ratings and some repair or maintenance advice, but not detailed repair instructions.
Level 3: a more detailed assessment of construction, defects, likely causes, repair options and future maintenance. Ask about it for older, altered, unusual or visibly poor-condition homes.
Both depend on safe access. If a loft or another area cannot be inspected safely, the surveyor records that limit. Discuss the property and your concerns with the surveyor before choosing.