you are quite safe round about it, the sandbanks are not a danger until you are further east. even at low tide there is a couple of meters about it.
if you look at some pictures of it at low tide you can still see masts/cables running through it. i tend to stay 100m from it to be safe, although i do know people who have been on it. they described it as smelly and as slippery as a slippy thing