Its clear that they didn't want his custom, hence the price. Remember my dad saying years ago, if he didn't have time to do a job, he would quote stupidly high prices, rather than turn people away...if they said yes, he would make time to do it.
Not sure why they point out its a £600 Corsa, you can do the same amount of damage in a £600 car as a £600,000 car.