The quality/safety of some of the cheap Chinese is frightening. I quite often get emails (at work) from the safety authorities with examples of some of the equipment they have confiscated for not meeting the relevant standards. There is also a massive counterfeit market for chargers etc, many of them are lethal.
Don’t try to save a few pounds on cheap chargers, cables, extension leads etc. Get them from a reputable retailer. Also be warned that some of these goods are sold on well known websites via third parties.
Oh – and the CE mark means nothing to most of these ‘manufacturers’, they just slap it on.