wheel alignment

I’m planning to find a local garage with the Hunter kit to check the alignment as its supposed be the best for the job, assuming the operative is competent of course. I'm sure I read 'something somewhere' that after a realignment, something in the car’s system needs resetting? Does that ring a...

I've gotten a control arm replaced on my Leon, and the car pulled quite badly to the right after and the steering wheel wasn't centered. The dealer told me that they had an alignment done, but they'd try again at a new place. A few weeks have gone by and the wheel has definitely drifted away...