2018 Peugeot Boxer Aux/USB

I have the same problem. My 2017 Boxer socket has 2 USB ports in the centre of the dash like yours and one only works intermittently so I am interested in the responses.

I've read that using a can of compressed air to blow any dirt out the usb port may do the trick. I find this gadget useful, with it you can see if there is voltage (blue)  and if the lead is ok and plugged into a phone etc it will show current flow (red) cost a couple of quid off ebay for this model 

Amesford thanks for the link.  My tester has just arrived and I tried in the house before going to the van to check that it works - it did.  It is a handy little item.  The USB socket below the dashboard is dead - no power shown at all.  Tried the USB socket on the top of dashboard shows 5+ Volts as do all the USB Sockets in the light fittings. 

Hopefully as the van is less than 2-years old it is covered by the vehicle warranty.  Getting its second year service on 7 August.