I've got a Christmas temp. job at Clinton Cards right now. I started on 1st November and finish in mid-January, but there are permanent places for those who do well. We were taking in loads of CVs past the initial deadline (1st November), so maybe see if there's one near you still hiring!
The work is only so varied but it's OK if you can handle the tedium: a lot of it is working on tills, pushing our rewards scheme, tidying cards and maybe getting stock out after hours. My manager seems pleasant enough, if a little absent-minded sometimes, and the people are all friendly and supportive; there are definitely worse places to be working. The pay isn't stellar but it isn't abysmal either, given what some places (e.g. The Works) are offering U18s.
If you apply and get an interview, do a little research on them first and think about why you'd want to work for Clintons (i.e. tell them what they want to hear) so you're not left floundering.
Happy hunting!
Yours,
Grey