Bright blue creme
Royal Court is a vintage Nails Inc bright blue creme from early 2009, maybe 2008.
Coverage and application were great, swatches are 2 coats with no top coat.
I also did a couple of comparison shots with a more recent bright blue, All Saints Road
They're pretty dupey but not quite there. All Saints Road is a little lighter and dustier than Royal Court. But All Saints Road is much easier to get hold of on ebay.
And in case you were wondering, neither is a dupe for Nails Inc's most famous bright blue, Baker Street, which is much more intense and cobalt leaning.