I have a Vauxhall zafira and I can hear a grinding noise or rumble when pressing accelerator. The car seems to rev a bit too without any relative pressure from accelerator. The noise gets louder the faster I go. It's an auto diesel 1.9 if that helps. Just had dog unblocked, maf replaced and brakes done although there is some squealing.
P.s love your videos very informative and fun.