So I've just had this problem occur where when I'm driving along, I can upshift perfectly fine from gears 1-5. But when I go to downshift, it's difficult to downshift into gear 1 & 2. 2 is practically impossible to downshift too. Thing is, when I'm stationary (engine running and not running), I can go into all gears fine.

Anybody able to help me?

Don't know if it's related or not but had a similar issue on my Giulietta when first picked her up and others reported similar only happening in 1st and 2nd, it was fixed by replacing the 1st and 2nd gear synchros to a different plastic version as they were different to the rest (I assume the first two gears needed to be different as they take the most strain getting the car moving). Alfa acknowledged this as a common fault and replaced them free of charge, I don't know what ford would do though.

It's virtually impossible to get into 1st doing 10mph or more in my experience. That's quite normal. 2nd is on the same synchro so I'd expect the car would stop you going into that gear at to higher speed.

If it's still under warranty take it back to the garage.