HELP! Newbie Trip Planning Headache to Windsor

Hi All..

My wife and I took the plunge recently and purchased our very own motorhome ( 2018 Swift Escape 685 ) We call her Maisie and she's a very lovely ex Swiftgo rental outfit that I believe was based in Manchester once upon a time LOL!!

Anyway.. We had our very first shake down trip to Norfolk recently and managed to find our feet relatively trouble free. Okay.. we might have reversed her into a wall when we backed her off the drive for the first time but it looks like a good polish might banish the worst of it and we're still friends :-)

So.. We now want to attend an event being held at Windsor on the 8th of April. Looking for a 3 night stay arriving on the 7th. The problem we are having is that we are looking for a Hardstanding site with EHU that allows 2 dogs and has an MSP. However, this doesn't seem to be possible in the immediate area as according to our location map most sites are farm CL's. Obviously, we need to be able to empty our grey and black water waste before leaving for home on the last day so feel we can't even consider any sites without an MSP ( or can we?? )

Do any of you experienced people out there have an alternative solution for our trip that maybe we aren't aware of? Any help would be greatly appreciated.

Kind Regards

Adam