I got a great deal on a Panasonic unit from NCR in Nottingham, I got them to fit it too. Made a great job and at considerable saving over Halfords, I wasn’t particularly confident with Halfords technicians.
I also fitted MX5 parts uprated door speakers which other than the connectors are a straight swap. Very pleased with the result. Apple Car Play so much better than anything from Tomtom or Garmin