At the weekend I had a TA (the first in months - but that's probably a reflection on my travel habits).

I was listening to MP3s; the radio was tuned to BBC R4 with AF working.

The player paused and switched to radio for long enough to hear a station name (BBC Midlands or something?), but then it switched me to Radio 4. A few seconds later I intervened to return it to MP3 mode.

Is it possible that AF and TA fight with each other, so that the stronger Radio 4 signal won against the local station? Or is AF suspended until the TA has finished?