The honest answer: trade and retail versions of the same paint are tuned for different users, and the gap is real.
Trade paint is built for people doing it all day. It tends to dry and recoat faster, lays off harder, and is formulated to take a beating once cured — think scuffs, washing, knocks. It often comes in bigger tins (5L+) at a better price per litre, and the colour range is sometimes pared back to the workhorses. Trade emulsions like Dulux Trade and Crown Trade are staples on professional sites for exactly this reason.
Retail paint is aimed at the occasional decorator. It's designed to be forgiving — better open time so you can fiddle without lap marks, lovely flow, and often a richer-feeling finish straight from a smaller tin. The premium brands — Farrow & Ball, Little Greene, Mylands — are essentially "retail" in spirit: gorgeous depth of colour, beautiful to live with, but slower drying and pricier per litre. You're paying for pigment and finish, not site productivity.
The "but what about" question: *is trade always cheaper and better?* No. Trade emulsion can be thinner and less opaque on the first coat (built for spraying and volume, not single-coat coverage), and the trade colour cards are often dull. If you want a specific designer colour like Little Greene::French Grey or Farrow & Ball::Cornforth White, you're buying retail — there's no trade shortcut to that pigment.
My practical steer: for woodwork and trim, trade-quality products genuinely earn their keep — harder, faster, cleaner. Dulux Heritage and Little Greene's Intelligent ranges sit in a sweet spot between trade durability and retail finish. For statement walls in a feature room, buy the proper retail colour you actually love. Don't cheap out on the colour you'll stare at every day to save a few quid per litre on a tin you'll empty once.