I have ceiling speakers in my house and I am looking to set up my iphone to play spotify through them. Can anyone give me some recommendations on AV units that have a usb port without having to spend hundreds of pounds on

We’ve a mini Denon system that has USB in and (and DAB/CD/optical/etc). https://www.denon.co.uk/uk/product/compactsystems/minimicro/dm39dab

If you already have an amplifier just buy a cheap USB DAC.

https://www.amazon.co.uk/Behringer-UCA202-£29

I can highly recommend this Yamaha AV Amp . DAB tuner for all your 6music needs, Bluetooth, Apple Airplay and Spotify Connect (so when you are playing Spotify it’s going direct to the Amp and not to your phone so you’re not using Phone battery and can make calls/surf net etc without interfering it – your phone just becomes a remote control. Has usb connections as well if you need it,