Report Casiobury Park & The Grove - The Grand Union in General Boating Posted July 21, 2018 On Monday we collect our boat from P&S Marine at Croxley Green where we have had the hull blasted and epoxied. I was considering heading north a little and chill axing for a few days before we do an about turn and take a leisurely cruise in the direction of the Thames. Casiobury Park and The Grove (Grand Union) appear to be green areas which would suit me so I could walk our black lab pup. Never having been there in my life are they in fact reasonable ares for the above purposes. Suggestions gratefully received.