This warm white tone is a colour match from a window obtained from the Charles Brooking Collection. The window was rescued from Whiteley village in Weybridge.
Whiteley looks amazing on the photos of the roof trim contrasting with Blackout.
Coverage is approximately 15-20m2 per litre per coat (160-220 sq.ft. per 33.8 fl.oz. per coat). This equates to about £6.53 per square metre (US $0.79 * per sq.ft.) for the finished job done in three coats (one coat diluted and two further coats undiluted).
The finished job for Farrow and Ball Exterior Eggshell (plus primer) is approximately £8.92 per m2 and Dulux Weathershield Quick Dry Exterior Satin (plus primer and undercoat) £11.13 per m2.
(* Exchange rate $1.30 to £1.00, December 2020.)