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Congrats on the scope. The Cassini Div is a little tough. I only saw it a couple of times from my backyard in my 12". It is a lot easier in my 20" but have found still need really good conditions for it to be clear. It is visible in an 8" but wait for really near perfect seeing so use a lot of patience.
Viewing at Wye Rive should be OK. You may find the seeing not as good as inland as there is always a temp differential between land and sea, but I would leave a final say on that to more experienced observers than I.
You mentioned colour. Apart from planets, stronger coloured stars and some planetary nebs, most DSOs will show no colour, they are simply too dim to activate the colour sensors in your eyes. In my old 12" I once saw a suggestion of green and pink in M42 and the green is very noticable in the 20", but with an 8" you are looking for grey!
That said there are lots of easy interesting objects well within reach of an 8" so good luck with it!
Malcolm
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