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.



Mortgage Responsible Lending Update
Alistair MacDougall Compliance 2019, FCA, Mortgage, Switch, Update
The FCA has published the first summary of the discussions from the responsible lending implementation group.