1:50,000 Map With Powerline and Obstruction Overprint

[Sky Sports]

Simple question, does anyone know of a good source of used 1:50000 maps with powerline and obstruction overprint? I think i am right in saying only the MOD produce them new and they are very selective on who they supply to.

[IO540]

The O/Survey 1:25k and 1:50k maps have large (400kV type) power lines - I've just checked.

Obstructions ... they all show them, but how small do you want?

[chevvron]

'Special' 1:50,000s with what you want displayed in BOLD are/were available via MOD as part of the Low Flying System planning stuff. There was an excellent one for instance, of the Salisbury Plain and surrounding areas, plus I think moost of the UK LFA's had their own individual charts; some being overlaid on existing OS 1;50,000s and other as in the case of SPTA were double size

[Sky Sports]

Just to clarify, the maps I am after have the words, 'Powerline and Obstruction Overprint' written across the top margin in blue.