I’ll be honest, I’ve not reviewed this one but, for just 75p with free shipping, you can’t go too far wrong (well, unless your phone explodes whilst charging, perhaps).
Normally £4.83, this special price is for the first 400 items, so you have to be a bit rapid. It’s available here and gets two 2.1A USB outputs on the top.
Just whack it in your cigarette lighter / power outlet in the car and then plug in the appropriate cable for your phone, speaker, dashcam or whatever.
Perhaps buy all 400 of the early-bird cheap ones and then sell them on the market after Christmas for £3 each. Make yourself some cash eh? 😄