Hi
This may have been done to death, but it's still a valid question, and I'd always be supportive of someone who is carrying something to help them if they get into difficulty whilst "out there" rather than the "I carry a credit card and a mobile phone because you are always near help" brigade...
So - Genuine question deserves a genuine answer - I'd go for a BCB kit, as the components are generally good quality, and then open it and get rid of the tea light candle (and replace with a smaller, long candle, or one you have shaved square), and possibly see what else you can fit in there (scalpel / single side razor blade, cotton wool balls soaked in vaseline, small photon type torch/soletaire mag light etc etc), and then re-seal it...and always carry it!!!
In the UK a mobile phone is a survival aid without doubt, yes there are dead spots for signals, but more often than not you can get through.
British Red and I are on the same wavelength here, you don't need a little tin, you should already have the kit on you when you are out and about. When I spoke to Mors Kochanski in 2006 he seemed 'surprised' at the amount of kit we carried here in the UK and the money we spent on it, why? OK if your a kit 'hound' I'm a stove 'hound' I just collect them, don't need them, but collect them, so if you want a dinky survival tin buy a few
But ask yourself the question, what is in the tin that will do a better job than what you have with you out in the woods (or hills)? Forget the fishing lines, don't need them to 'survive' in the UK, button compass? don't you have a compass on you if needed? Wire saw? they are crap, don't last two minutes, most of the kit in these tins is just tat, rubbish you don't really need.
If your off to the Arctic, or Jungle/dessert ect its a different ball game and well out of my sphere of experience, but I'm pretty sure you would need more than a small tin or pouch to carry the gear you needed to survive.
Bush, you've not ruined my Christmas, I've had a wonderful day and welcome to the forum, but, and there is always a but, don't rush it; don't feel you need to buy this or that bit of kit just take your time.