OS map To LL - where is the top left of a map.

I have a list of OS coordinate ie

map 164, 491291 (1:50000 maps)

which I am trying to convert to Lat long (to import into google earth)

If I look on the map this is SP491291 (which I can trivially convery to LL)

The problem is that I have about 30000 points (and they are being created
every week). I can not get the creator to append the two letter code as they
only work on paper maps, so do not care about the exact position (and it
would be a tedious task)

Fortunately a numeric position is unique on a 1:50000 paper map.

What I need is know the top left corner position (in either LL or 8,10,12 os
gb references) of every map.

Or does some one have a better idea (go to the local library and write them
all down !)

Thanks

Tony


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