Right, i'm back... and considerably lighter in the wallet department.
I took a tape measure with me and found that the plastic JG end stops are too wide. so i've gone for all copper which is more expensive, but i also chose to go for compression fittings because if i'm to chop and change the design i want to be able to take it all apart easily, which added further cost

and they only do microbore 10mm piping in 25m coils which was £18. the solder end stops are considerably smaller than the compression fit ones so i know there wont be a problem there. the compression fit ones are litterally about 1/4 of a mm short of 18mm :shock: so the first thing i'll check when i get home is whether or not this will go in the bottle before unwrapping the rest of the gubbins, so i can take it back if not. the compression end stops have alot on copper on the end, so i'm hoping i dont snap too many drill bits when drilling the holes hehe.
also had to get a couple of tools.
so here's what i got:
25m roll of 10mm microbore
5 tees, compression fit
6 end, stops compression fit
hacksaw as i wasn't prepared to spend £20 on a pipe cutter, i've got sandpaper to smooth the burrs
adjustable spanner
I wanted to get another screw on hose adaptor for the outlet of my pressure washer but they didn't have any, but i reckon i can wing it somehow. cant do much without a flow control tap but i think copper compression fittings can take more PSI than JG fittings, i'll read up though before i hook the badboy up though.
i can pinch a hoseclip off my chiller to jack the test system into a corny
Total cost for experimentation so far is £73.84 this better be worth it haha!