Why can't things be simple? OK, after a lot of messing around this thread is now called "Design your own Shameless covers" - not very original but it does what it says on the tin!
For some reason I could change the first post's title but it wouldn't change the whole threads title so to do that I had to move it to another section, changing the title in the process and then move it back. There must be a simpler way but I couldn't see it!