Liberty do these perfume experiences, £25 and you get taken into a separate room and have someone talk through all the perfumes in a brand and let you sample them all..includes refreshments. Quite good value. It was my birthday so they offered prosecco, then poured not a flute but a massive gin glass full to the brim and kept topping it up.
After the experience they left me with the remainder of the bottle in the booth and said take your time! Help yourself! Obviously the intention was to get me so pissed I'd lose any self control and buy lots of perfume.
WELL IT BACKFIRED! I staggered back to covent garden and spent a lot in tom ford and parfums de marly.
But it is the cheapest and nicest way to get pissed in central London for sure.