No lights just come up gear unavailableIt certainly possible. Did you have any lights on the dash? Do you know when it was replaced and what mileage it has done? You would need to get it plugged in to know for sure.
Just a bit worried driving it around in case it happens againI would carry on using it until the clutch goes pop - then get the AA/RAC to take it to Sports Italia - You may find out is was just a glitch and enjoy those c10k miles you still have left in the current one.