How does your friend know for sure its the tracking? Did he have it checked independently before it went back to Reg Vardy? And did he have it checked after it was returned? (or even when you say 'its still the same?')
I had a similar problem with a Vectra SRI, I took it to Reg Vardy (assuming it was the tracking). They actually replaced a front anti-roll bar as the joints were knackerd and 'apparently' this had caused un-even wear.
Get your friend to take it back, present the case and demand clear cut answers. It worked for me! They replaced the tyre and adjusted the tracking (not to mention the new anti-roll bar!), which wasn't required after all
Phil.