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OK, long pic-heavy post - so I'll try and keep it light on the text.
Butter London HRH. Nice standard royal purple, red-toned base. I did two coats but it could probably have done with three since the base is a little jelly-ish. Me being me and compelled to fiddle with things that ought not be fiddled with, I put Nfu.Oh 51 over the top and the result really wasn't pretty:
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Urgh. Sooo, that lasted all of twelve hours before I took it off. But I wanted to try 51 over something else because the real draw is the amazing blurple jelly base colour, which was totally lost over HRH. So I swatched it over (L-R) Orly gogo, illamasqua wink, illamasqua force, and OPI dim sum plum. And the result was much prettier:
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Orly Gogo is just a total PITA to apply and not worth the 7 coats of polish (4 orly, 3 of the flakies) but 51 looked lovely over any of the other three. Two coats on force and dim sum plum, three on wink. I will definitely give this a full outing soon, because I really like the duochrome pinky colours in the flakies (just not over HRH...dear God not over HRH). Do click to enlarge this one, it's a doozy.
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As Borat would say: 'naaaaaaice. Vairry naice.'
Edit - the UK Nfu Oh retail site has now launched. It's at Nfuoh.co.uk. Enjoy!