I recently replaced the factory stereo in my Seat Ibiza with a Pioneer
DEH-P3500MP. All is fine, except I get extremely bad MW reception now.
It was fine before, but is now almost inaudible. The FM reception is
perfect.

Not sure if it's relevant, but I had to buy one of those ISO-DIN
aerial adaptor things
(http://www.halfords.com/shop/item.asp?id=130997).

Any ideas/solutions to my MW woe? Don't wanna be without the football
scores on a Saturday drive!

Any advice gratefully received...