There is a specific rule requirement to disclose any possible disadvantages in the suitability report. The rule (COBS 9.4.7) can be seen here: http://fshandbook.info/FS/html/FCA/COBS/9/4.
Remember that a disadvantage is different to a risk. For example, there is a risk that investments can fall in value, whereas a disadvantage would be that the recommended product has higher charges than the product being replaced.



Consumer Credit – When to Apply for Full Authorisation
Steve Bailey Compliance 2014, 2016, FCA
The FCA has issued guidelines to firms about when and how they should apply for full consumer credit authorisation. All firms who hold interim permissions or are new to consumer credit should read on.