Depends where you are on the payscale how long it will take you to get another post. If you are on UPS and looking for a standard class teacher role then it could (seriously) take years, and maybe you never get a permanent one again. If you are on MPS2 or 3 then you can probably get one for September. If it definitely much easier to get a post when you are already in a post, rather than doing supply. However doing supply for years will be better than having such allegations on your record, however nonsensical. Next application 'widen professional experience' is a good cover all.