Hi Gary,
I stayed about 5 times there last year (I live in East Hull so it's perfect for us!). The complex is nice and new (if a little pricey and small - it's unsuitable for busy periods).
The pitches are very uneven - and a little close together but the warden was very flexible and went out of his way to make getting in and set up easy.
The toilet blocks are prehistoric but were always spotless and the showers in the portakabin were very clean.
We only stayed out of peak season (we didn't get the caravan till august) so it may get dirtier in peak season but from what I have seen I would unreservedly recommend it - I've booked again this year.
But they could do to go over the pitches with a roller a bit! it's pretty uneven - take wheel chocks and you should be fine.