National Map 45% open

What data is expected?

High level map at a scale of 1:250,000 or better (1cm = 2.5km)

What data is available

•   Does the data exist? Yes
•   Is data in digital form? Yes
•   Publicly available? Yes(as National Map published by Information Systems Division, Cabinet Office)
•   Is the data available for free? Yes
•   Is the data available online? Yes (Here)
•   Is the data machine readable? No (javascript HTML)
•   Available in bulk? No
•   Openly licensed? Unsure (No URL given)
•   Is the data provided on a timely and up to date basis? Yes

Details

(C) MANNGIS on visualisation but MannGIS is a government service and the Ts&Cs on the footer reference a new IM OGL open government licence .

ESRI ArcGIS also has a free tools for low end reuse.