i worked in a warehouse over the xmas period and wasn't given a choice, they told me what hours to work, when to work etc, the choice was do it or get sacked, i was on £6.31 an hour, there was no overtime pay as such it was £6.31 no matter how many hours you worked.

and the hours you work depend on the work your doing, sitting in an office 10+ hours a day no problem, 10+ hours a day walking up and down a warehouse (not for me), i think the biggest gripe ive got is the 0 hour contract.