These made great looking plants but the cobs are disappointing. They were supposedly meant to be "mini-corn" (Minipop F1 from Mr Fothergills) but are much the same size as normal corn and you can judge the quality for yourselves:
Having checked the seed packet again it says to harvest them before the kernels form at approx 10cm long. But surely they wouldn't be ripe then? And the picture on the packet shows cobs with ripe kernels. I may have to investigate further.