Tks - it has integrated bluetooth & all the connections looked tight when I changed the fuses.
Been told it's most likely the amplifier which failed (apparently they're known for this) - BMW wanted €800 for a replacement unit which considering it's 12 year old tech and just a single din cd head unit is absolute madness

I ordered an Eonon GA9365 - https://www.eonon.com/Android-Car-GP...tooth-5-0.html

€350 delivered and comes with free reversing and dash cameras - looks straight forward to fit so plan to do it myself...