The Thai authorities are trying to close several fake accounts so have tweaked the settings on the control portal in Chang Wattana, it should be resolved soon.
If you are on a Tourist visa you can use your UK licence. If you are on a non o etc you need a Thai licence. Don't worry though the fines only 400 baht and you can use the finer receipt as a get out for 21 days after.
You need to complete a form Sor T OE, and send a picture of your injury with your husband with a copy of your passport and a completed power of attorney.