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So, was out at a cafe and ordered a huge slab of one of their tray bakes, and it was amazing and I want to make it.
I asked her what it was called so that I could ask for it again (and not frantically google!) and she said it was crackle, but she did have a very prounounced accent so it is entirely possible I misheard. I've googled and found nothing vaguely similar.
It was (as far as I can work out) similar to mars bar crispy cakes, but with chewy toffee and cornflakes rather than mars bars and Rice Krispies. And it has raisins or sultanas through it.