I agree that it can be frustrating to put the same information into web sites multiple times, but if you only do this for 5 quotes, you could (potentially) save yourself a LOT of money. Once you have those quotes, then make sure to contact FBD and ask them to match the lowest quote (assuming you are comparing like for like) and if they can't, then move to the lowest quote that you are happy with, assuming that the level of cover is sufficient for your needs.
The main issues with on line quotes are for things "not in the norm" - e.g. specified items that need to be covered (jewelry / ride on mowers / bikes / sheds etc). Different companies treat these differently, so these may need documentation and / or a call back from the provider to confirm cover requirements.
So, just set aside an hour of your time, to go through the work on line. It will be worth it.