What's the best home teeth whitening kit?

I want to whiten my teeth, but i don't really want to use strips, i would prefer trays!
i dont really want to splash out on it, so something that works well, but preferably under 60 quid!
also if you dont really know which one is best, could you tell me which ones I SHOULDN'T USE!
i've seen a few ones that seem good, but then again they all seem good lol!
PLEASE HELP
thankyou
xx

NOne work, you must get it done at the dentist