After proudly refitting and reclipping all hoses, topping it up and cleaning the mess made I was deflated a little to realise I hadn't refitted the rubber collar that sits between the tank and the housing.
![Mad :x](./images/smilies/icon_mad.gif)
I think I'll be revisiting the filters again very soon so just put it somewhere safe for now and will keep an eye out for spillages in the meantime.
It was interesting to note the large filter was not clogged but the thinner longer filter was pretty mucky. Additionally, the bottom cap of the level indicator tube/housing had a fair layer of silt so I guess it's ok to assume the tank has too.
All in all, the hyraulics obviously needs a good flushing.