All parts are in stock and good to go same/next day.
If the kidney brackets are corroded then they will have to be replaced, however from your image it appears to be the panel that runs behind the petrol tank that is corroded and if that is the case, just remove it as it serves very little purpose.
IMHO, this panel should not be an MOT failure as it is not structural
However I have the panels in stock if you wish to replace.
Kidney brackets are also in stock.
Alex