This Signatory 100 Proof (British 100 Proof is 57.1%) Glenrothes (presumably misspelled purposely) is from a 2015 vintage, bottled after 10 years in a First Fill Oloroso Sherry Butt (cask #50).
This 2014 vintage Craigellachie from the Signatory 100 Proof (British) range is composed of whiskies from 1st Fill PX Sherry Hogsheads, 2nd Fill Oloroso Sherry Butts, and Dechar/Rechar Hogsheads, bottled at 10 years and 57.1%.
Bottled under Signatory's 100 (British) Proof range, this 2011 vintage Inchgower was bottled at 57.1% after maturing in a First Fill Oloroso Sherry Butts.