I paid the RAC's mobile mechanic to fit a new injector. He'd never done it before, replaced the wrong one, and then told me he'd dropped gunk into the engine. He then left and didn't leave any notes on the system. It took HOURS to speak to anyone at the RAC and when I did, I was told that I owed THEM £40 for recovery. I was eventually given a courtesy car while the vehicle was inspected at a local garage. The RAC's customer service - and back covering - is disgraceful. Avoid and use the AA is my advice.