That’s three OSs, count ’em. OS OS is their gmaps-like API. It’s in beta, non-commercial and is OSGB projected. Slippy map, markers, bubbles… it’s all there. Someone in the audience pointed out the data quality in the countryside is much better than what’s available now (eg, google). No link as yet.
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Not much more information, but there is a link at:
http://www.e-consultancy.com/news-blog/361936/ordnance-survey-opens-up-to-developers.html
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