We normally ask you to try to resolve your issues informally first (we call this Stage 0). It's always best if you can raise your concerns as soon as possible with a member of staff who works in the area where the issue arose.
If you are not happy with the Stage 0 response, you can take your complaint to Stage 1 - this will need to be submitted no later than three months after the incident you are complaining about.
Our website has guidance on making a complaint and all the relevant forms as well as being a comprehensive resource for all the questions and concerns that you might have about the complaints procedure.