My son has just turned 13.
He doesn't get pocket money as such, but we buy him his weekly comic and some sweets (probably around £5 per week). His dad sorts out his mobile phone at £10 a month.
If he helps around the house/keeps his room tidy etc, then he will get (for example) a new game for his PS3.
He usually knows what he wants and how much it costs, so will work towards getting it, which can take a month, depending on the cost.
As an aside, I used to have to wash my dad's two cars for pocket money....two massive Ford Zephers lol
edited to add that then, that amounted to 50p