B.384 Lowther £20 DA01 000544 , first million & low serial (first 1000 notes put in circulation) A/UNC
As this was not a new design type the 1st 1000 notes
go to BOE staff or into circulation , Debden Security printers used notes 1001 -2500 for sets .
So this is a low serial for a First Million and not from a
Debden set .