Highclere house

Hi going to highclere house (Downton abbey)
Does anyone know can you park a motorhome  I the car park.or is there a good campsite  near by.
Thanks

Long time since we visited and I can't honestly recall whether we went in the motorhome or the car, but parking is on grass (apart from the dedicated coach park) with no individual spaces marked so I can't see it being a problem - see Google map satellite view below:

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I assume you just mean parking for the visit, not overnight.
Make sure you book well in advance as at busy times the limited number of day tickets go quickly.