I know Fiestas are known for rattles but looking for help on where to look that does not require ripping up the dashboard lol! Essentially it sounds like something a little loose, like a wire or something hitting against the dash. On flat roads no sound, but on bumpy roads you can hear it. 

What places should I be looking. It's coming more from the passenger side of the car.

Check the glove box, also check there is nothing in the door pockets

1 minute ago, Neb_engineer said:

Check the glove box, also check there is nothing in the door pockets

I have taken everything out of the glove box. If I take out the box itself, can I get to more than just the fuse box?

So turns it’s the A-Pillar that is causing the rattle. I pushed it in as it seems to have popped out a bit. Noise is almost gone. 
 

i feel it could be a bit more secure, the rattle seems more at the bottom. Any tips to improve and how easy is it to remove and replace the clips?

Tessa Tape ( some are like the fluffy side of Velcro ) tend to be the go to for quite a few dealers where trim rubs against trim ( a-pillar to dashboard ) or trim to body or glass. If the fixings are good and you don’t feel they warrant replacement then tape is worth a try.