Unfortunately the "Open Space" data contains Northings and Eastings instead of Latitude and Longitude. This makes integration with Google maps very different unless you convert between the two.
Conversion is possible, but it's very complicated. The OS offer a spreadsheet which contains formula, so you can bulk convert the points you are interested in, but it's not as accurate as we might like.
So, we're waiting for either the OS data to include accurate lat / long info, or for a google maps type solution which supports northings & eastings (the free OS online map works through a full api rather than the static way that the google map works - so is harder or impossible? to integrate into Qlikview).
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