The Spare Parts Catalogue for Mark V calls on page 47A (for late cars) of the 1958 edition for H.2800K Hose, High Pressure shown as YZ.11 in plate YZ. The entry calls for two such hoses, presumably meaning left and right sides use the same hose. Page 45 (for early cars) for 1601 Hose, High Pressure (H.2800/K), not shown in plate Z. This entry calls for one hose, but is showing parts counts for only one side of the car while page 47A is showing parts counts for both sides combined.
I don’t have the lengths measured for you, but it seems both front wheel hoses are the same specification from the parts catalogue.
There are other flexible hoses in the brake system. H.2800/K is called out for Hose, Flexible from front Three-Way Union to bracket on Right Hand Anchor Plate, AZ.66 in plate AZ. And H.1222/E Hose, Flexible from bracket on Chassis Frame to Three-Way Union on Rear Axle AZ.85.