T-Line Main Bracket Part Fell Off

So the bottom part of the main bracket hinge bolt fell off from the looks of it. Obviously I'm gonna get this replaced ASAP but I wondered if the bike is still usable whilst I wait for the part to arrive.

Also can anybody help me with which part I should be ordering here, it wasn't obvious from the Brompton website and I couldn't see anything under T-Line parts.

Thanks in advance!