Most giffgaff ideas now turn out to be duplicates.
To solve this I suggest that when you type the name of your idea (the title) the system runs a search for this on the ideas section. It then suggests to the user (perhaps a column on the right) that there are other threads similar and then they could choose not to post it. I know everyone says 'just search' but the reality is there are many people who don't. This bit of coding that is probably not too complex (I'm no programmer), would save a lot of everyone's time!