A 35‑year wine collector, also a chartered financial analyst, has mapped every bottle in a spreadsheet but admits he cannot trust quoted market prices. Merchants routinely show bid levels that sit 50 % below purchase costs, prompting him to ignore those signals. The real value, he says, hinges on net transaction prices, not advertised offers.

Liv‑ex estimates at least 60 million bottles stored in the UK, with annual warehouse fees of £10‑£20 per 12‑bottle case. Bordeaux Index adds a 0.25 % levy on any bottle above £8,000. A 12‑case of Château Léoville Barton 2003 bought for £282 now trades near £900‑£1,000, erasing roughly £250 of storage over two decades. Deposit rates have risen to 4%, raising the opportunity cost of tied‑up capital.

Former analyst Sara Danese built a spreadsheet to compare 2025 en primeur releases with earlier vintages. After deducting storage and carry costs, most 2025 bottles appear overvalued; the 2025 Bélair‑Monange at £88 per bottle is 40 % pricier than the 2016 and 2019 versions, which already benefit from ageing. Some producers, such as LVMH’s Cheval Blanc, have trimmed prices, but the broader market still inflates many collections.