DAB sounds worse than FM wrote:

Thanks for your help. I went to a car audio place today to ask if
they had clips to get my Sony out but they didn't and they said use a
couple of thin flat-head screwdrivers so I'll try and get it out
tomorrow.

You'll probably also need to get the facia unit out too as the catches for
the Pioneer unit are bound to be different to the Sony one. That normally
involves bending the tags back out from behind the dash, can be awkward but
keep those screwdrivers around as they might help there too

Dan