Just returned from a 9 day stay at this site over the Easter period.  To keep it to the point:

The Good - A well maintained site. Huge Pitches. Nice Park for children.

The Bad -  Lots of unwelcome noise from Longleat Safari Park. Lots of mud due to previous inclement weather.

The Ugly -  Previously you were able to walk in and out of the grounds.  For us this was great as the children could play in the open park areas and you could use facilities like the coffee shop.  This has now been stopped and entry is only allowed if you pay for a day pass.  We did pay for the one day but to be fair once you have done the safari and the house there is not a lot much else to see, certainly not worth paying the £200+ price for a 5 day pass for example.

I spoke to a lot of people over the period of the stay and they all seemed to share this consensus. It seems a shame as previously it seemed like a bustling (in a good way) site but consequently ,even over the Easter period, seemed half empty.  I wonder (through no fault of the Caravan Club) if the changes to Longleat Estate's rules and the inaccessibility of close walks will/are starting to have an adverse effect? Hope this helps!