I thought this news may be of interest to anyone using Scottish OS maps.
The Map Library of Scotland [part of the National Library of Scotland NLS] are from 2 April 2013 offering a new service of paper or digital copies [400 dpi colour tiff images] of in-copyright [within the last 50 years] but superseded paper maps. From September 2013 they are 'expecting to be able to supply geo-referenced images' too. So no need to calibrate a .jpg!! The cost will be normal copying & p/p charges plus an OS copyright fee.
The NLS prices are considerably less than the 2 [licensed partner' companies to whom the OS outsourced the facility when they abruptly withdrew the superseded library licence in April 2013.