Glenrothes 23 Years Old 1997 Cask #15400 (Whiskybroker.co.uk)

Whiskybroker.co.uk operates as a UK based independent bottler and cask broker, presenting numbered releases under direct cask identification rather than themed series. The firm draws from broker held stocks with releases pitched at accessible volumes and price points. This Glenrothes 23 Years Old, distilled in 1997 and bottled in 2020 from cask 15400 at 54.8%, runs to 393 bottles released into the UK market under the firm's Second Release line.

Twenty three years in a single Oloroso cask sits firmly in the long extractive window for sherry maturation. The cask's first fill activity has tapered, with secondary extractions of lignin and hemicellulose leading: syringaldehyde, vanillin and eugenol from slow lignin breakdown alongside furfural from hemicellulose chemistry. The residual Oloroso sherry's sotolon contributes the savoury walnut backbone that distinguishes long aged sherry, with ellagitannins structuring the spirit through accumulated cask interaction.

On the nose, nutty depth sits with dark chocolate and dried fruit, tobacco and honey threading through alongside polished oak. Sherried sweetness emerges underneath. The palate moves through fig, raisin and a savoury walnut depth, with 54.8% strength delivering the cask's accumulated chemistry without astringency. Cocoa nib bitterness emerges mid palate. The finish runs long and tannic, European oak holding the spirit's Speyside fruit in tight balance against the cask's oxidative chemistry.