A survey isn’t compulsory for property auctions but it can be recommended.
However, if you are unsure about the structure or condition of the property then you might wish to instruct a surveyor, an engineer, or your builder for advice.
Remember that contracts are exchanged on the fall of the gavel, so if you are wishing to bid then you need to complete due diligence prior to the auction. So you would not be able to get a survey done after winning the property at auction, and then retract the sale based on the outcome of a post auction survey. Buyers cannot renegotiate offers or pull out (in unconditional auctions) after they've made a successful bid.
Consult with the auctions team if you have concerns, they may be able to assist and suggest a specialist that can help.
Surveys aren't the same as appraisals (valuations). Appraisals are required before auctions.