Glad you managed it.
I fitted mine tonight after work, I do encounter them annoying use once clips quite a lot and usually the small screwdriver trick works, didn't seem to be getting anywhere tonight so I switched to plan B which was side cutters (not sure what other name could call them) to grab the crimped bit and do a bit of twisting on it to create a gap underneath the get the driver in there, my jubilee clips were quite a tight fit but am sure theyll be ok.
As for the top pipe it had its own little use once clip on top but it seemed too far up to really hold it fully so I managed to pull it off and then push it back onto the 007p as it was, it aint got to hold any pressure so can't see it causing an issue.
As for the valve, I only changed mine on accounts of knowing the plastic ones are crap, decided to get the vacuum tester on both valves and test how much vacuum it took to lift the valve off its seat, found that on the crap one I had to actually hold the ports in order to get vacuum to even hold, it just leaked straight out of the side port lol so turns out the damn thing was in need of a change after all. Money Well spent i'd say.