I know this has been asked before many times but I'm having trouble understanding it all. I used to work for McDonalds
and left the end of September. I started my new job the second week in October. Its been over a month now and I still have not had my P45 from McDonalds. I've just had my first pay slip from my new job and I'm on the tax code BR. I was previously on 522L and I told this to my new employer.
So what I'm asking is, what should I do and how long does it take to get my tax back that I'm owed?

So what I'm asking is, what should I do and how long does it take to get my tax back that I'm owed?