Returned the iTrip back to the shop I bought it from. Thankfully they just accepted the return without asking any questions or wanting to give me store credit.

I’ll take a knife to my car’s stereo and see if I can make a normal one fit in the hole. Halfords sell converter facias, but the last one I bought didn’t fit at all. The bloke behind the counter implied I was a moron by not removing the car’s own radio cage first. I was going to counter with ‘that’s because it doesn’t come out’ but couldn’t be bothered. Nor could I be bothered enquiring how I attach a new cage to some flimsy plastic facia in such a way that it remains secure. The thing I can buy looks to just be a hole filler, rather than anything to bolt into the car.