hi,
you only need to be FCA registered if you are giving advice or taking information on your site. To get round fca requirements you need to just offer facts and no advice, you can add banner links with affiliate ID's so that the data is taken off site. A disclaimer wont hurt for sure.
If you are doing decent business and want to take information on site or do more, you can work with an FCA registered company to become what is called an appointed representative (A/R) or (AIR) and they effectively carry the can for you compliance wise but need to vet you and see all content you add and do a full site audit.
Becoming FCA registered takes a few months and costs and there are hoops to jump through but it is certainly worth it in some cases.