A tall slim man and his friends huddle over a line of containers and take it in turns to noisily slurp a dark rich liquid before spitting it out and moving on to the next.
This might sound like a rowdy wine tasting session but it is actually the daily routine of the Twinings' tea tasters.
The slurping sound is so loud and sudden that it sounds positively indecent and not something you'd associate with such a refined British beverage. But with over 200 varieties of tea sold across 100 countries you can understand the experts' need to ensure consistency of quality and taste.
According to one of the tasters, it takes around five years to fully develop a tea tasting palette and as we discovered, that slurping technique is something of an art. Our feeble attempts left a lot to be desired.
With so many teas to try under the black, green and white categories it is amazing to think that they all originate from the same one plant, Camellia Sinensis. Much like wine, it is factors such as climate, altitude and humidity that account for their differences.
The bergamot oil and black tea blended Earl Grey is Twinings' biggest seller closely followed by English Breakfast although the company offers all matter of teas to suit every mood or state of mind including the Infusions.
Customers looking a bit stressed out? You could suggest Camomile and Spearment. Or if they're looking a bit sleepy serve them Lemon and Ginger.
I thought I'd give the Lapsang Souchong black variety a go. The tea leaves are flavoured by laying them over bamboo trays and smoking them with pinewood.
Sounds great but my tea-tasting palette must be pretty pathetic as I was soon reaching for the traditional English.
According to Twinings, making the perfect cuppa involves four simple steps.
1. Make sure the kettle is regularly de-scaled and use fresh water every time.
2. Use one teaspoon of tea per cup plus one teaspoon for the teapot.
3. Brew tea for three to four minutes or one to two minutes for white/green tea
4. Add milk first and then tea before serving
p.s. I always thought the rule was tea before milk but unlike Twinings I don't have 300 years of experience in tea-making so I think I'll let it rest.