The thread is about backup lighting right?
I carry a LED Mini Maglite round my neck on a Para cord together with a whistle (if I need to indicate my whereabouts to rescue or whatever) and a Silva map compass. I also now have a Maplins LED diver’s torch, very bright about as good as my Retro 2 on middle setting and only costs about £7. I haven’t seen the Tesco Q5 but the Maplins is small enough to hang round your neck and guaranteed waterproof and takes AA batteries same as my photographic kit. I also have one of the LED 'wind up to charge' jobs.
I am aware that with LED caplamp I have no backup pilot light so now carry extra spare. I used to carry a spare bulb in my helmet inside an old photo film container stuck to one of the straps with electricians tape, and practiced changing a bulb in the dark working inside my upturned helmet so as not to loose anything dropped, but with LED the old practices became obsolete.
My avatar is a poor likeness.