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.



MiFID II – Aggregated costs disclosure
Alistair MacDougall Compliance 2017, 2018, 2019, MiFID, PI
This new requirement is posing some questions about how it can best be implemented. We think that firms should wait until the mechanisms in the market place are a little clearer.