I went there on october 3rd, it was quite deep in the middle but there is not much water at the moment compared to what I have seen. It will probably be quite shallow now as it drains out fairly quickly seeing it hasnt rained much for two weeks.
That video is ok, i wouldnt call that a "deep day" though, I have seen it over the top of the banks on either side, that means its deep enough to go over the roof of a land rover!!!!!
EDit - I have seen the whole video now, that depth is about the same as two weeks ago. I think the bit at 6.15 is the deepest bit of the whole lane normally.
The best bit of advice I can give you is DO NOT GO FIRST, I have been down furneux pelham dozens of times and have seen plenty of flooded 4x4's. Use the person in front to gauge the depth.