If you travel frequently you will appreciate a good Euro plug. Cheap adapters are rubbish and I always find they struggle to fit in the plug then you have the UK plug handing off it. With most if not all the devices I take abroad with me being charged by USB it makes more sense to have a USB plug adaptor with swappable UK and EU plugs.
I previously used a random brand one off Amazon and the housing of the plug fell apart leaving potentially dangerous components exposed. So I have now switched to one of my favourite Amazon brands, Anker.
The Anker PowerPort 4 Lite is a simple product, it is a USB wall charger with 4 ports that can provide 24W of power and has two swappable ends, one for the UK and one for the EU.