At £7.90 I think for the quality you're getting something really special. You can easily spend £6 on a bog-standard polish from Boots, but for a bit more not only do you get the specialist service and experience, but a really great polish that you won't be disappointed with. Rituals has even got this philosophy on their website:
"Some 5000 years ago, the Chinese made nail varnish based on beeswax, egg whites, gelatine, colourings and gum. Their favourite colours were red and black. Long nails were once a sign of wealth: for rich women from the Chinese Ming dynasty they were proof that they did not have to perform manual labour. Gold or silver guards were used to protect their rice paper-strengthened nails. In ancient Babylon and Egypt you could tell someone's job, culture and status from their hands and nails. Cleopatra loved rust red varnish; Nefertiti's favourite was Ruby Red. Your nails are a barometer for your body's health and your hands are regarded as your visiting card, giving you good reasons to look after and pamper them regularly. Rituals has developed a complete line of nail care products. Fabulous for treating your nails with love!"
How lovely is that? So be careful what colour you choose - it could say a lot about you.