I took over my GFs old 51 reg One as well and had similar issues.
I can tell you that the rear washer can be a simple fix.
you need to remove the plastic cap at the bottom of the wiper arm and clean its pipe which has a tendency to get filled up with crap!
In regards to the engine noise, a slight ticking is normal.
Change the oil with some decent oil in and replace the oli filter as well on a couple of short intervals to make sure there is no grime left in the oil system.
Mine has just gone over 64k miles and going strong.
Hope you like yours