I’m setting up a flower delivery service called Flora n Posy and registered the domain “fnpflowers.com”. Ferns n Petals, a popular online florist, uses “fnp.com”. Will this cause any legal issues? Should I proceed with my business?

Using “fnpflowers.com” is likely to cause legal issues. Ferns n Petals has a strong trademark in “FNP”, and using a similar domain name could be seen as trademark infringement. You should consult a lawyer to assess the risk and explore alternative domain names for your business.